Cool down more...................
Answer:d.Paleozoic Era
Explanation:
Paleozoic Era is hallmarked by climate, animals & plants.
This Era includes the Ordovician Period, Silurian Period and the Devonian Period.
The Silurian Period is one during this era where aquatic plants and animals evolved.
The Challenger Deep is in the southern end of the Mariana Trench. It is estimated to be 305meters deep.