Where do B cells grow to maturity?

Give the biological term for: structures that display characteristics of living organisms only within living cells

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.

What environmental cues and landmarks do the geese use to determine the timing and direction of their migration over the mountains? how do they find their way?