Explain the changes in the number of algea in the lake from february to june

Hey me with this one❤☺❤ how do you say that a cell also has a life span and death like an organism? give one example.

How are mutations continually being generated in a population (what are some of the causes of mutatuions? ) explain

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.