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torisob [31]
3 years ago
12

7. What two developments had to occur for life to begin on Earth?

Biology
1 answer:
Artyom0805 [142]3 years ago
7 0
Fossils and species
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How are nails formed
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Nails start in the nail root, hidden under the cuticle. When cells at the root of the nail grow, the new nail cells push out the old nail cells. These old cells flatten and harden, thanks to keratin, a protein made by these cells. The newly fromed nail then slides along the nail bed, the flat surface under your nails.

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this weather system map shows 4 locations, W, X, Y, and Z across the united states. Which of the following statements is true ba
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How are ocean ridges and trenches related? Describe their relationship in
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Terms that are asked to be used in the response are bolded;

     Ocean ridges and trenches are related in a few ways. One of the ways is being created from the movement of tectonic plates on the mantle when they diverge and converge. When tectonic plates diverge they "pull apart" and create trenches. When they converge they "push together" and create ridges, subduction happens here. The tectonic plates move on the mantle of magna from convection currents creating these different boundaries.

Have a nice day!

<em>Note: Please keep in mind that if you would like to use my work you must reword it or give a proper citation, thanks.</em>

     I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly.

- Heather

8 0
3 years ago
The kidneys help regulate blood pH by excreting ___________in the urine and by reabsorbing _____________.
lutik1710 [3]

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The kidneys help maintain the acid–base balance by excreting hydrogen ions into the urine and reabsorbing bicarbonate from the urine

4 0
2 years ago
Select the correct answer.
Rufina [12.5K]

Answer: Hey again!

Option (a) is the correct answer.

Explanation:

Elemental form of carbon means the pure form of carbon, that is, carbon is present in its natural form.

An elemental form also means that the pure atoms are not attached to any other atom.

For example, diamond is an allotrope of carbon in which there are only carbon atoms attached to each other and no other atom is present in it.

Whereas methane has carbon and hydrogen atoms attached to each other therefore, it is not an elemental carbon. And proteins include different atoms attached to each other.

Thus, we can conclude that diamond is an example of elemental carbon.

Explanation:

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3 years ago
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