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tigry1 [53]
3 years ago
14

How have paleontologists contributed to humans' understanding of the history of life? Check all that apply. They created a recor

d of life on Earth. They grouped organisms by their similarities. They grouped organisms by the period in which they existed. They discovered that the first humans lived with dinosaurs. They discovered that life has existed since Earth was created.
Biology
1 answer:
OverLord2011 [107]3 years ago
8 0

Answer:

A.They created a record of life on Earth.

B.They grouped organisms by their similarities.

C.They grouped organisms by the period in which they existed.

Explanation:

Did the test hope this helps

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How were you able to determine if something was living, once living, or never living (non-living)?
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Answer:

Must have lived before.

Explanation:

For an organism to be classified as once living, an object must have been part of a living organism or is now dead. When a flower is plucked from a plant it is hard to distinguish between when it is considered alive and when it is now considered once living. An example of a nonliving object is an apple or a dead leaf.Apr 22, 2013

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What element makes up most of the earth's core?
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Solid inner core, hope this helps, 4300*C.
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What step of the carbon cycle is occurring when a plant absorbs carbon dioxide for photosynthesis?
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its B recharge hope that helps

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3 years ago
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2 Ashley missed school the day the teacher discussed the hierarchical relationships. Explain to her your reasoning for organizin
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Answer:

i dont know how

Explanation:

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4 0
3 years ago
4. The mass of ball A is 10 kilograms and the mass of ball B is 5 kilograms. If
Nookie1986 [14]
4.) We are told that ball A is travelling from right to left, which we will refer to as a positive direction, making the initial velocity of ball A, +3 m/s. If ball B is travelling in the opposite direction to A, it will be travelling at -3 m/s. The final velocity of A is +2 m/s. Using the elastic collision equation, which uses the conservation of linear momentum, we can solve for the final velocity of B.

MaVai + MbVbi = MaVaf + MbVbf

Ma = 10 kg and Mb = 5 kg are the masses of balls A and B.
Vai = +3 m/s and Vbi = -3 m/s are the initial velocities.
Vaf = +2 m/s and Vbf = ? are the final velocities.

(10)(3) + (5)(-3) = (10)(2) + 5Vbf
30 - 15 = 20 + 5Vbf
15 = 20 + 5Vbf
-5 = 5 Vbf
Vbf = -1 m/s

The final velocity of ball B is -1 m/s.

5.) We are now told that Ma = Mb, but Vai = 2Vbi

We can use another formula to look at this mathematically.

Vaf = [(Ma - Mb)/(Ma + Mb)]Vai + [(2Mb/(Ma + Mb)]Vbi

Since Ma = Mb we can simplify this formula.

Vaf = [(0)/2Ma]Vai + [2Ma/2Ma]Vbi
Vaf = Vbi

Vbf = [(2Ma/(Ma + Mb)]Vai + [(Ma - Mb)/(Ma + Mb)]Vbi
Vbf = [2Mb/2Mb]Vai + [(0)/2Mb]Vbi
Vbf = Vai

Vaf = Vbi
Vbf = 2Vbi

If the initial velocity of A is twice the initial velocity of B, then the final velocity of A will be equal to the initial velocity of B.

If the initial velocity of A is twice the initial velocity of B, then the final velocity of B will be twice the initial velocity of B.
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