How does aerobic respiration differ from anaerobic respiration?

Which of the following is an incorrect statement?

$(a)$ Explain why multicellular organisms need a transportation system for carrying food and oxygen.
$(b)$ Why does an organism require an excretory system?

Name the following with reference to the alimentary canal:
$(a)$ $(i)$ The largest gland.
$(ii)$ The gland that secretes digestive enzymes as well as hormones.
$(iii)$ The part where digested food is absorbed.
$(b)$ What are villi? Mention their function.

Single circulation,i.e.,blood flows through the heart only once during one cycle of passage through the body,is exhibited by:

Define transpiration. State its two functions.