Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
--------
Question: Water leaves ponds and lakes through evaporation and also as outflow.

Answer: Water leaves ponds and lakes through evaporation and also as what?


Question: Phospholipids are vesicles made of.

Answer: What are vesicles made of?


Question: As the population grows, competition for food grows.

Answer:
As the population grows, competition for food does what?