The exosphere is the thinnest layer of earths atmosphere. This also the layer of earth's atmosphere that is closest to space.
The second one changes in the amount of atmospheric gases because it think it might effect everyone including plants and animals because will all breath the same air rather than a mountain building it might affect the animals that like there.
For the answer to the question above, I think the answer is that the <u><em>f</em></u><u><em>rogs have a BACKBONE.</em></u><span>
</span>which the <span>phylum like squid, snails, and jellyfish don't have. I hope my answer helped you. Have a nice day ahead!
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Answer: A
Explanation:
because I used it during the quiz an I passed so, that is the correct answer.
