Answer:
I believe it is D With the help of my notebook
Answer:
A chemical element is a type of atom with the same number of protons in their <u>atomic</u> nuclei.
Explanation:
For an example, the atomic number of Chlorine is 17, and there is 17 protons in Chlorine.
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The Biosphere, is the layer of the planet Earth were life exists.
The gradual abundance of oxygen (by product of photosynthesis) made it possible for aerobic organisms to grow more and evolve.
Hope that helps!
