5.1a Animals and plants have a great variety of body plans and internal structures that

contribute to their ability to maintain a balanced condition.

5.1b An organism’s overall body plan and its environment determine the way that the

organism carries out the life processes.

5.1c All organisms require energy to survive. The amount of energy needed and the

method for obtaining this energy vary among cells. Some cells use oxygen to release the

energy stored in food.

5.1d The methods for obtaining nutrients vary among organisms. Producers, such as

green plants, use light energy to make their food. Consumers, such as animals, take in

energy-rich foods.

5.1e Herbivores obtain energy from plants. Carnivores obtain energy from animals.

Omnivores obtain energy from both plants and animals. Decomposers, such as bacteria

and fungi, obtain energy by consuming wastes and/or dead organisms.

5.1f Regulation of an organism’s internal environment involves sensing the internal

environment and changing physiological activities to keep conditions within the range

required for survival. Regulation includes a variety of nervous and hormonal feedback


5.1g The survival of an organism depends on its ability to sense and respond to its

external environment.