Explain how the potential for specialization varies with cell type and how it varies over the life span of an organism.

What type of appendages do sponges cnidarians roundworms annelids mollusks arthropods echinoderms and vertebrate have? jointed, not jointed, absent  

Body temperature is tightly regulated in mammals for example when external temperatures drop too much the body of a mammal response by in order to it's core temperature.

Which characteristic of potassium’s makes it useful for dating rocks