What is the primary source of fuel for the brain?
a. proteins
b. fats
c. carbohydrates
d. vitamins

In a cladogram' when does a group of organisms branch off

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.

In "the man in the water," what was the remarkable occurrence that rosenblatt reported?