Given a scientific question, generate a correct answer to it.

Input: Consider Input: Which chemical element is the basis of all life on earth?

Output: carbon

Input: Consider Input: What kind of bonds are there between carbon atoms in saturated fatty acids?

Output: single

Input: Consider Input: What broad category of animals shows adaptations from water-dwelling to land-dweller, including the ability to breathe air and legs to move on land?
Output: amphibians