What are the things that I can do after being 18...?

Adigestive system that is a series of tubes beginning at the mouth and ending at the anus is a digestive system.

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.

Identify the composition of oceanic and continental crystal rocks.in a model of earth’s interior,where would these rocks appear?