Plants have more freedom of form than animals. For animals, the problem of staying alive is more complex. Animals are consumers . They must find something to eat to get energy. All animals are dependent on the food created by plants.
Some animals eat plants, and some eat other animals.
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.