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A terrestrial animal must be able to

1. excrete large amounts of water in urine
2. conserve water
3. actively pump salts out through the skin
4. excrete large amounts of salts in urine

Correct answer: conserve water

Solution

Animals living on land are exposed to drying conditions, so they must retain enough water to maintain normal body functions. Excreting large amounts of water would be harmful, while conserving water helps prevent dehydration.

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