True or false? a disease that lasts three months or less is a chronic disease.

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 diagram shows the layers of earth. convection currents in which region influence the movement of tectonic plates

Plsss > .< compare and contrast the characteristics of flatworms rounds worms and earthworms