Ineed comparing and contrasting autotroph and heterotroph.

Both are living things but autotroph can make its own food using surrounding materials and light or chemical energy. heterotroph cannot make its own fool and relies on others for food.

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

the electromagnetic energy from the sun arrives in the form of visible and invisible light.