I think it’s this one(There is little rainfall, and frequent fires regularly cut the vegetation to the ground.)
B-cells fight bacteria and viruses by making Y-shaped proteins called antibodies, which are specific to each pathogen and are able to lock onto the surface of an invading cell and mark it for destruction by other immune cells
Equator area: closest to the sun and hot and humid due to the mass evaporation from the excess heat.
Mid equator/south pole: somewhat mild, colder, probably mid-humid, depending on which end of the midsection you're going for
South Pole: cold and dry. Cold because it's naturally far away from the sun (like the north pole) and dry because there isn't significant water evaporation here and any that may form crystallizes into snow and ice.
We study evolution as a way to help us figure out ways to understand earth and our biology more and how to survive major catastrophes and stuff like that
