What kind of molecules that allows glucose molecules to pass through?

Which of the following is not considered an appendage of the skin? nails glands follicles none of the above

What type of competition exsist between two species. turtles and fish

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.