How do you expect the density of a piece of wood to compare to the density of water ?

Hey me with this one❤❤❤❤ every organism needs food. does a cell also need it? explain very briefly.

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.

The chemical form of energy that is useable by the cell to do work