Answer:
<em>Thermosphere</em>
Explanation:
<em>The </em>thermosphere<em> is one of the different layer of the atmosphere from all the other layers of atmosphere.</em>
<em>As thermosphere does not consist of mix gases, and it only consist of one gas. It is on the up of mesosphere and it remains down of the exosphere. And ultraviolet radiation are also caused in this particular layer of the amosphere of the earth.</em>
it makes u know more about the society
This is due to the change from winter to summer solstice
To me it looks like the answer is a because i dont remember him using that as evidence for his theory from bioligy<span />