Fact 1: Energy enters ecosystems in the form of sunlight or chemical compounds.

Fact 2: Energy requirements Energy is required for both growth and maintenance.

Given the two facts above, answer the question "What do ecosystems use sunlight for?" with the following options: 
- recovery
 - food
 - darkness
 - growth
 - trials
 - pain
 - stay warm
 - Cooking


 

    growth     