Cuales son los componentes anatómicos del sistema endocrino y del sistema Urinario?

Sea stars, sea urchins, sand dollars, and brittle stars are all memeber of a group, what is the common name of the group they are all in

Are the earth's ocean floor and continents the same age geologically? why or why not?

Asmall population of chimpanzees lives in a habitat thant undergoes no change for a long period of time. how will genetic drift affect this population