How do mullusks differ from echinoderms? how are they similiar?

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 best describes the structure of the declaration of independence?

The distribution of related animals and plants across the world