What originally came from from living cells such as bacteria

Why is excretion necessary to maintain homeostasis?

This is one of the five kingdoms in the older biological succession. organisms in this kingdom are prokaryotic

Why do leaves change color in the fall? green pigments break down and no longer mask the color of chlorophyll. chlorophyll breaks down and no longer masks the colors of other pigments. red- and yellow-colored pigments grow and mask green-colored chlorophyll. green-colored chlorophyll breaks down and turns red and yellow.