Question

Explain why a large animal, such as a human, needs special adaptations to organs that exchange materials with the environment (such as the lungs, small intestine and kidney), but a single-celled organism does not.​

Answer 1

Answer:

Because of their smaller surface area: volume ratio, larger organisms need transport systems to move substances, such as oxygen, around the body to where they are needed. ... They also need specialised exchange surfaces where substances can enter and leave the transport system by diffusion.