[Free Registration/Login may be required to access all resource tools.] Discusses how cells are organized in living things and explains the origin and significance of multicellular organisms.

Take an interactive quiz over animal structure, function, and behavior. After completing the quiz, check your score, and then revisit any incorrect question for further review.

This lesson will show the 8 levels of organization in living organisms, ranging from smallest to largest. It is 2 of 4 in the series titled "8 Levels of Organization."

This lesson will show the 8 levels of organization in living organisms, ranging from smallest to largest. It is 4 of 4 in the series titled "8 Levels of Organization."

This lesson will show the 8 levels of organization in living organisms, ranging from smallest to largest. It is 1 of 4 in the series titled "8 Levels of Organization."