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artcher [175]
3 years ago
14

Most of the Earth's oxygen occurs in the form of minerals in the crust and mantle. The oxygen that is available in the atmospher

e is
used primarily by plants, animals, and bacteria to perform cellular respiration.
Why is running out of oxygen still not a real concern?

A. Oxygen is recycled through the interrelated processes of photosynthesis and cellular respiration.
OB. Oxygen can easily be mined from rocks and sand and then be released into the atmosphere.
the
OC. The Sun creates more than enough new oxygen atoms in the atmosphere by splitting phosphate molecules.
OD. Lightning creates large quantities of ozone, which quickly breaks down into oxygen molecules.
DONT TELL ME LINK
Biology
1 answer:
hichkok12 [17]3 years ago
7 0

Answer:

I think A

I hope this helps!

Explanation:

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How much work is done on a 100-N boulder when you lift it 2m straight up?
zzz [600]

200J

Explanation:

Given parameters:

Force on boulder = 100N

Distance moved = 2m

Unknown:

Work done = ?

Solution:

Work done on a body is the force applied to move such body in the direction of the force.

           Work done = force x distance

Input the parameters in the equation:

       Work done = 100 x 2 = 200Nm or 200J

The work done in lifting the boulder is 200J

Learn more:

Work done brainly.com/question/9100769

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5 0
3 years ago
Which is an abiotic factor that can be found in a rain forest ecosystem?
Ivanshal [37]
Abiotic factors are things in an ecosystem that aren't alive. 

Here are a few examples of abiotic factors in a rain forest:

1. Sunlight
2. Water
3. Soil
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Hope this helps!
8 0
3 years ago
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What enzyme or function is being affected in mutant (a), causing many mismatched base pairs?
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DNA polymerase is the enzyme that is responsible for adding correct nucleotide pairs to new and growing DNA strands. Mismatched base pair errors will occur if this enzymes is not able to function optimally. There are other system that work DNA polymerase, these are proof reading system and mismatch repair system. Less than optimum function of these system will lead to uncorrected mismatched base pairs. 
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4 years ago
A elephant cell has 20 chromosomes. how many chromosomes will the cell have just before mitosis begins in the elephant cell?
lora16 [44]

The elephant cell will have 20 chromosomes.

Cells undergo interphase before getting to the mitotic phase. At the S phase of the interphase, the amount of DNA in the cell is double by replication. However, the number of chromosomes remains intact.

Thus, the cell gets to the mitotic phase with the same number of chromosomes that is usually present in normal vegetative cells of the animal.

More about mitosis can be found here: brainly.com/question/13536882?referrer=searchResults

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According to Darwin, organisms with traits that are best suited for the environment will
Llana [10]
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