Respiratory structures of two different animals-a fish and a human being are as shown. Observe (a) and (b) and select one characteristic that holds true for both of them.
A. Both are placed internally in the body of an animal.
B. Both have thin and moist surfaces for gaseous exchange.
C. Both are poorly supplied with blood vessels to conserve energy.
D. In both the blood returns to the heart after being oxygenated.
Answer:B
Respiratory structures of two different animals-a fish and a human being are as shown. Observe (a) and (b) and select one characteristic that holds true for both of them.
A. Both are placed internally in the body of an animal. B. Both have thin and moist surfaces for gaseous exchange. C. Both are poorly supplied with blood vessels to conserve energy. D. In both the blood returns to the heart after being oxygenated.