Egg cel :) because egg cells are used to produce offspring.
Cephalization describes the process by which organisms develop a distinct head. The head of a cephalized organism contains a concentrated group of nerves, or brain, that controls the rest of the organism, as well as specialized organs for consumption and perception, like mouths, eyes and ears. Cephalized organisms exhibit a distinct division between parts of the body; they have a front, back, top and bottom. These animals comprise the bulk of animals that are encountered on a daily basis.
sea star following organisms exhibits cephalization
It can lead to hypothermia (specifically too cold) then that leads to death. when you die that sucks.
hope this helped:)
Because you either have what it takes to survive in a certain place or you don't and you die quicker and you have offspring that grow to these standards while you couldn't because you didn't come from a younger generation which has a better immune system or better camoflauge or certian ways they can and can't eat and somethings that their bodys do to help them survive rough times.