In either case, they are taking in a concentrated form of energy. In order to have a steady supply of food, animals must either locate themselves where there is an unfailing supply of food or find ways to move to where the food is. Mobility Living things do what they must to find food. Although we think of plants as being immobile, plants grow toward the light, and can slowly turn their leaves to take advantage of whatever light is available. The cells on one side of a stem divide, becoming two cells and making that side longer, so then the stem bends.
Vines use a similar process to twine around a support.
Using this method of uneven growth, plants can move their leaves and flowers. Some plants can move a little in response to stimuli from the environment. Sensitive plants can move their leaves in response to touch, and Venus fly traps will close their leaves around insects. Plants need to scatter their pollen so that the next generation of plants will be strong. They also need to scatter their seeds.