What accounts for the huge diversity of the B cell receptors the immune system uses to fight antigens

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 any four organelles that should be present in the eukaryotic organism and describe the function of each organelle

Any sound above what db can cause hearing loss in human beings