Walruses live in the Arctic and have a thick fat layer. The ancestors of the modern-day walruses might not have had such a thick layer. Over time, the walruses have probably changed. According to the theory of evolution by natural selection, what is the most likely reason that this change has probably occurred?

The walruses that had thicker fat layers were more apt to survive and live to reproduce

Explanation:

The walruses gained a thicker layer overtime because they adapted to the cold environment allowing them to slowly grow a thicker layer of fat.

for 8 am not sure maybe yes?

for 9 if it is asking if the male is more or less it would be less

hope i even just a little : )

"d.) carbon dioxide and hydrogen sulfide"