Question

18. How are villi, alveoli and nephrons similar?

A. They are internal organs.
B. They provide large surface areas for molecular exchange.
C. They secrete hormones.
D. They have a role in excretion.

Answer 1

Answer:

Villi, alveoli and nephrons are similar as :-

B. They provide large surface areas for molecular exchange.

Answer 2

Answer:

B. They provide large surface areas for molecular exchange.

Explanation:

alveoli gas exchange in the lungs

nephrons water retention in the kidneys

villi nutrient absorption in the small intestine

https://www.jstor.org/stable/10.1525/abt.2011.73.3.7

shapes:

villi : finger

alveoli : sac

nephrons: tubule, cup

wikipedia

niddk.nih.gov

cancer.gov

verywellhealth.com

ncbi.nlm.nih.gov