A) excrete large amount of water in urine
B) conserve water
C) actively pump salts out through the skin
D) excrete large amount of salts in urine
Correct Answer: B
Solution :
A terrestrial animal must be able to conserve water. Mammals are ureotelic because they excrete urea as a waste product. They do not excrete ammonia because it is highly toxic and it cannot be stored to any appreciable extent. Therefore it is a excretory product of aquatic animals like protozoans, sponges coelenterates etc.
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