why don't scientists know the exact number of species that have lived on earth ​

Answers

Answer 1
One of the reasons we can't get an accurate count is that the bulk of the things that have yet to be discovered and described are in the realm of the very small: insects, bacteria and other microbes.

Related Questions

Please help me!!! With this

Answers

Answer:

1. Collided 2. Impact 3. Scattered

Explanation:

I honestly just guessed from the photos and sorry for commenting in the beginning I'm pretty new to brainly.

Which two bodies of water are connected by the Suez Canal on the map above?
A. Letter A and Letter B
B. Letter B and Letter C
C. Letter C and Letter E
D. Letter D and Letter E

Answers

Answer:

C and E

Explanation:

The Suez canal connects the Mediterranean Sea to The Red Sea

Answer:

The answer is right C.Letter C and Letter E

Explanation:

how do erosion, desertification, deforestation, and damming impact the environment?
A. they negatively impact the environment by limiting greenhouse gas emissions
B. they positively affect the environment by creating more places for humans to live
C. they positively affect the environment by protecting biodiversity and animal habitats
D. they negatively impact the environment by destroying soil, animal habitats, and waterways​

Answers

Answer:

D

Explanation:

edge 2020

Answer:

D

Explanation:

Which demographic indicator would best align with high educational attainment in a more developed country?

Answers

Answer:

Demographic indicators of income status.

Explanation:

The education attainment of the nation such as developing or developed ca be seen in terms of higher standards of living and describes the schooling, along with the teachers and students. A higher-income status would best indicate the level of education as many countries don't have money to continue for higher studies. Thus are unable to take higher education and are school dropouts.

The outermost electrons is an atom's electron cloud are called ____

A. sons

B. isotopes

C. valence electrons

D. neutrons

Answers

Answer:

I think its c but i may be wrong.

Explanation:

why is time at advanced in East and backward in the west of the earth? give reason​

Answers

Answer:

It is actually a simplified view of the earth's rotation because the tilt of the earth's axis with respect to the plane of the earth's orbit means that sometimes sunrise occurs slightly earlier or later along the same longitude.

Explanation:

Where are most of Europe's agricultural fields are located?

A) Northern European Plain

B) None of these answers is correct

C) Along the Mediterranean Sea

D) In the coastal Nordic regions

Answers

Correct answer is D I did this I got it right

A Whole New World: The Search for the

Environment for New Life


Challenge:

The year is 2080; teams of scientists have been studying the feasibility of living on different planets in our solar systems based on their research on water and soil samples from four newly discovered planets. In 2065, teams ran various tests on each planet’s most abundant liquid to determine which one had a liquid most like water and could possibly sustain life. In 2070, teams made recommendations to the United Nations based on various tests on each planet’s soil to determine which soil on these four planets would best support the farming of soybeans. The United Nations had chosen soybeans for many reasons including the ease in growing, soil tolerance, nutritional value, food products that could be manufactured from soybeans, dietary health, ability to use as animal feed, organic fertilizers as well as a source for a variety of bio fuels. These missions have been instrumental i

Answers

Answer:

is this even a question for a test????

Explanation:

What are the characteristics of global ecosystems?

Answers

biodiversity, particular climate (hot, cold, humid, dry) abiotic factors, biotic factors, populations of organisms, communities, and the trophic level and niche in which each organism within an ecosystem can be categorized in.

A region based on common properties such as population is called an?

Answers

Answer: Formal Region

Explanation: Formal Region is the correct answer.

Formal region like the other person said up above. That’s correct for the question.

Without gravity, our universe would not exist. All things have gravitational pulls, but the larger the object, the larger the pull. This explains why planets and other celestial bodies are greatly affected by gravity. Think about ways our planet and the solar system are affected by gravity.

Pick all that apply


Moons' orbits around planets

Annual amounts of snow on Earth

The moon has less gravitational force than Earth because it is smaller and has less mass.

The orbit of each planet in the solar system is controlled by its moon(s).

Mass is the force that holds people and objects to the Earth's surface.

The Sun's gravitational pull is what keeps the planets in its solar system in orbit.

The Sun has more gravitational pull than any planet in the solar system because it has the most mass.

The smaller the distance between two objects, the larger the force of gravity between them

Answers

Answer:

The Sun's gravitational pull is what keeps the planets in its solar system in orbit.

Explanation:

because every planet must orbit the sun and others.

Answer:

Statements that are correct are: moons' orbits around planets, the moon has less gravitational force than Earth because it is smaller and has less mass, the Sun's gravitational pull is what keeps the planets in its solar system in orbit, the Sun has more gravitational pull than any planet in the solar system because it has the most mass, the smaller the distance between two objects, the larger the force of gravity between them.

Explanation:

Option 1: is correct because all moons are orbiting around planets because the planets are the closest objects that are also larger are influence them the most.

Option 2: is not correct because the snowfall on Earth has much more to do with the conditions on the planet than it has with the orbit.

Option 3: is correct because the moon is much smaller than Earth, and its mass is even smaller proportionally, thus its gravitational force is much smaller.

Option 4: is not correct because the moons don't control the orbits of the planets, but the other way around.

Option 5: is not correct because gravity is the force that keeps people and objects to Earth's surface.

Option 6: is correct because the Sun is the object with the most mass and gravitational pull in the solar system, thus it has a big effect on all objects in it.

Option 7: is correct because the Sun is by far the biggest objects in the solar system, and it also has by far the biggest mass, thus its gravitational pull is incomparably bigger than any other object in the solar system.

Option 8: is correct because the closer the objects are the stronger the gravitational pull between them, and the further away they are the weaker the gravitational pull between them.

This continent is located at 30N by 90E

This continent is southeast of North America

This continent is located at 30N by 90W

This continent is located south of Africa

This continent is located west of Asia

The continent with latitude and Longitude of 0 by 0 is


The continent that is northeast of Antarctic is


0 latitude is called the

What Ocean is east of Africa

What Ocean is at 30N by 150W

Answers

Answer:

bn                                                    

Explanation:

HELP ME PLEASE HELP HELP HELP

Answers

the 4th one and 1st one and 3rd one

What type of power was first used in the north?

steam
oil
coal
water

Answers

Answer:

coal i believe.

Explanation:

have a good day

What is shown in this illustration?


continental-continental convergence boundary


oceanic-oceanic convergence boundary


divergent boundary


transform boundary

Answers

Answer:

The answer is B. Oceanic-Oceanic convergence boundary

I took the test and got it right.  Good luck!

Oceanic-oceanic convergence boundary is shown in this illustration. Option B is an appropriate response.

What is Oceanic-oceanic convergence ?

Two oceanic plates converge or clash during ocean-ocean convergence. Under the convergence zone, the denser plate subducts into the asthenosphere, creating a trench on the surface. The zone of subduction is the area beneath the convergence zone.

Examples of ocean-ocean convergence zones are the Aleutian Islands, which were formed when the Pacific Plate was subducted beneath Alaska, and the Marianas Trench, the deepest portion of the ocean, which was formed when the Philippine Plate was subducted beneath it.

Two oceanic lithosphere-based plates colliding is referred to as an oceanic-oceanic convergent boundary. One of the plates will subduct beneath the other even if this boundary comprises the same kind of lithosphere.

Hence, Option B Oceanic-oceanic convergence  is an appropriate response.

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A megalopolis is most likely to develop where -
O push factors outnumber pull factors
Othere is access to educational opportunities
raw materials are available for industrial development
transportation routes and major economic development have concentrated

Answers

Transportation routes and major economic development have concentrated

If you were analyzing a population pyramid, which age and gender would be most
affected if there was a war?

Help!!!!

Answers

Answer:

The age between 18 and 35 of the male population would be the most affected if there was a war.

Explanation:

In a scenario where there is a war, the population that will be affected (negatively) the most will be the male one. In the case of war, in almost all countries in the world, it is the male population that is mobilized, while the female population is not (except in North Korea for example). In general, it is the male population between the ages of 18 and 35 that is mobilized, as this is considered the best age for it.

The male population of this age will have a very negative effect, or rather its numbers will drop in the total population. This will happen because there will be a lot of soldiers that will lose their lives on the fronts, doesn't matter will the war be won or lost. This will also have a negative impact on the female population of the same age group because a lot of them will remain without their husbands or partners, there also will be a lack of males for creating families.

What park and mountain preserve is south of Phoenix and west of chandler? Plzz help

Answers

Answer:

''South Mountain Park and Preserve'' is located south of Phoenix and west of Chandler.

Explanation:

South Mountain Park and Preserve is a municipal park, in fact, it is one of the largest parks of this type in the United States. This park is located just south of Phoenix and just west of Chandler, thus being situated in between large urban areas. Despite being surrounded by urban areas, this park has been well preserved and kept in good shape, while also being made suitable for numerous activities.

This park is very attractive, not just for the locals, but also in the region, as it offers a lot. The lovers of nature often visit the park as it is a very beautiful one, but it also offers very beautiful views. The people that are into extreme sports, such as mountain biking and mountain cycling have a lot of excellent trails. Because of the excellent organization and tracks, the hikers and joggers are a common sight.

Answer:

'South Mountain Park and Preserve'' is located south of Phoenix and west of Chandler.

Explanation:

There are still 350 isolated

indigenous groups in what section of

the Americas?

A. North America

B. Central America

C. South America

Answers

Answer:

B. Central America

Explanation: Central America is made up mostly of islands.

According to figures by Territorio  Indigena & Gobernanza, there are 375 indigenous peoples in the Amazon of Peru, Ecuador, Colombia, and Brazil Hence option C is correct.

What are Isolated Indigenous ?

which at least 71 are living in voluntary isolation, have a deep understanding of nature, and continue to live in a self-sufficient manner.

The indigenous people of the world, particularly those in the Americas, have experienced significant losses over the last few centuries. This was brought on through genocides, forced assimilation, forced marriages, and colonization. Some indigent individuals have had more luck than others, and they have continued to exist in this way up until the present.

The Amazon is home to the bulk of these tribes in the Americas. The rationale is straightforward: It is a vast territory that provides everything they require for but prevents modern civilisation from influencing and gaining access to them. There are thought to be 350 indigenous groups in this region, while there is a strong possibility that there are more given the small populations in question and how difficult it is to locate or get in touch with them.

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Please help me out a bite ;(((((((((((((((((((( This is hard but it is urgent ;(((((((
What are all the different soils of the Earth?

Answers

Answer:

There are three main types of soil—clay, sandy, and loamy. There are also other types of soil, depending on the type of underlying rock and the climate and vegetation. Loams are a mixture of clay, sand, and silt, and are more fertile than other soils.

Here are the different types of soil:

Tundra soilsPodzolsPodzols and Brown EarthSpodosolsChernozemsAlfisolsVertisolsAridisolsFerralsolsMontane soils

Some of the soils are very weak, due to the fact that there are harsh environmental conditions, like aridisols (desert soil) and Tundra soils.

Hope this helps you!

Please select the word from the list that best fits the definition measures wind speed weather vane, barometer, radar, statellites, thermometer, anemometer

Answers

The answer is an anemometer

Answer:

anemometer

Explanation:

6. Which statement explains why tectonic plates move?*
10
A. Plates move because Earth's interior is slowly cycling.
B. Plates move because they are slowly expanding and growing larger.
C. Plates move because landforms cause them to move in different
directions.
D. Plates move because of the weight of the oceans pressing on parts of
Earth's surface.

Answers

Answer:

a.B

Explanation:

the plates grow larger and move causing earthquakes and volcanic eruptions.

Tectonic plates move because they are slowly expanding and growing larger.

What is tectonic plates?An enormous, unevenly shaped slab of solid rock known as a tectonic plate also known as a lithospheric plate is typically made up of both continental and oceanic lithosphere.The Pacific and Antarctic Plates are among the largest, however plate sizes can range from a few hundred to thousands of kilometers broad.The Earth's crust and uppermost mantle are divided into enormous fragments called tectonic plates. Oceanic and continental crust both make up their structure.Mid-ocean ridges, as well as the significant faults that delineate the boundaries of the plates, are subject to earthquake activity.Tectonic plates move because they are slowly expanding and growing larger.

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whats a ouji board ?

Answers

its a board used to contact spirits (its up to you to believe it or not)

do you mean Ouija Board? if so its known as a spirit board, which has the alphabet on the front side of the flat board. It’s used to communicate with the dead faster than other communications, though its been criticized bu the scientific community to be characterized as just pseudoscience. its up to you to believe in it or not, I personally don’t believe in spirits but I like a little imagination in my life.

do you trust Pontiac and the information he presents? Why or why not

Answers

Answer:

I trust the information he’s giving because I did research and, indeed, the mistreatment of their people since the British began to rule their areas was cruel and true and I think that is a reason to go to war.

Explanation:

hey guys does anyone want a cat within louisianna range they are about 5 other six months old they are potty trained and really good if u want to cuddle or play I would really like to keep them together ​

Answers

Answer:

What general area of Louisiana are u in?

Explanation:

Answer:

[tex]hii[/tex]

have a nice day ✌️✌️

Federations of American Indians were groups of
families.
villages.
bands.
tribes.

Answers

Answer:

D) tribes. (other things in this quiz) (down below)

Explanation:

In approximately 1500, Europeans exploring the East Coast interacted with American Indian groups from..

B) The Northeast and the Southeast.

American Indian men in both the Northeast and the Southeast...

B) hunted.

Which of the following statements best describes a characteristic of an American Indian tribe in approximately 1500?

B) All members spoke the same language.

Most men in the American Indian cultures of the Northeast...

C) Held councils and built shelters.

Which of the following statements best explains how the Iroquois Confederacy was different from other American Indian confederacies?

C) The Iroquois Confederacy was well organized and effective.

What factors promote and affect world trade

Answers

Answe

Explanation:

A country's balance of trade is defined by its net exports (exports minus imports) and is thus influenced by all the factors that affect international trade. These include factor endowments and productivity, trade policy, exchange rates, foreign currency reserves, inflation, and demand i hope you understand that u-u

Mexico's political structure differs form that of the united states because?

Answers

Answer:

the vice president does not serve under the president.

Explanation:

i hope this helps:)

What are the average high and low temperatures (in degrees Celsius) for Isla Hoste in August?

Answers

Answer:2.2 c is normal 5.6 c is warmest -1.0 c is coldest

Explanation:

Isla Hoste experiences an annual average temperature of 41.0°F (5.0°C). The average temperature for the warmest month is 49.0°F (9.4°C) in January.  Hence In August High was 45 degree (5.0°C) and lowest was -10 degree .

What is high and low temperatures ?

The forecast high is the maximum temperature anticipated for that day, which is often in the late afternoon. The forecast low is the temperature that is predicted to be at its lowest during the upcoming overnight period, which on most days will happen around dawn the following morning.

The normalized high or low for at least 30 years is the average high or low temperature. A statistical average is hence a mean high or mean low. Records must be maintained at for an average high or low temperature to have statistical significance, at least 30 years must pass.

Information about high and low temperatures is frequently taken to mean that these are the USUAL high and low temperatures. Temperatures that are average are NOT usual.

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How would Canada’s development be described?

Answers

Answer:

Canada is considered a developed country.

Explanation:

The economy of Canada is very diversified, with important sectors in agriculture, manufacturing, and services.

Canada also benefits from a continuos stream of immigrants, representing a steady population growth that also boosts economic growth.

Canada also has a very important oil and gas sector in Alberta.

Canada's estimated GDP for this year is 1.6 trillion, and its estimated GDP Per Capita is $42,080

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