Which is not a characteristic of bacteria?
a. they are unicellular.
b. they are prokaryotic.
c. they are the smallest form of life on earth.
d. they are multicellular.
d. they are multicellular.

Building glycogen from glucose molecules is an example of what

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.

Which structure in the cardiovascular system connect arteries to veins?