During ecological succession, how does the growth of young hardwoods affect the organisms living in an ecosystem? A.Grasses and low shrubs are unable to obtain the amount of light they need to survive, so there are small numbers of them.
B.The trees provide shelter and food for a variety of mammals, insects, and birds.
C.In autumn, falling leaves provide a source of energy for decomposers such as fungi.
D.All of the above