7. What system in animals has the transport of nutrients and other materials as its main function?

A. Circulatory
B. Nervous
C. Endocrine
D. Integumentary

Circulatory System

Explanation:

The Circulatory System transports oxygen, carbon dioxide, nutrients, waste products, immune components, and hormones. Major organs include the heart, capillaries, arteries, and veins. The lymphatic system also transports excess fluids to and from the circulatory system and transports fat to the heart.

Molecule, cell, tissue, organ, organ system, organism, population, community, ecosystem, biosphere.