The answer is : Thermosphere. At this point the homosphere (troposphere, stratosphere and mesosphere) ends at about 80 km from the surface, gas molecules<span> are here</span>bombarded<span> by X-</span>rays from the sun<span> and subsequently form the ionosphere.
Hope this helps! :)</span>
Mostly during the summer, July would be the best month to see them.
a. RNA molecules is the correct answer.
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Paliozoic era- sea life
Mezazoic era- dinorours
Centozoic era- current time