What does a short-day plant need to flower

Which animal group is the largest and contains more species from all the other living groups combined? is it mammals or

Why do german shepherds shed so much

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.