Given a scientific passage and an answer, generate a question for the given answer.

Passage: Not all wetlands are alike, as you can see from Figure below . Wetlands vary in how wet they are and how much of the year they are soaked. Wetlands also vary in the kinds of plants that live in them. This depends mostly on the climate where the wetland is found. Types of wetlands include marshes, swamps, and bogs. Answer: wetlands
Marshes, swamps, and bogs are types of what?

Passage: boundary between air masses that is stalled in one place. Answer: aids
Opportunistic diseases are usually the direct cause of death of people with what disease?

Passage: Plants and animals exist in a cycle; each requires products of the other. The thousands of coordinated chemical reactions that keep cells alive are referred to collectively as metabolism. In general, metabolic reactions are divided into two classes: the breaking down of molecules to obtain energy is catabolism, and the building of new molecules needed by living systems is anabolism. Answer: anabolism
What is the term for the metabolic reaction where living systems build new molecules?