Fact 1: Planting trees has a positive impact on an ecosystem.

Fact 2: An ecosystem includes the organisms and their habitat.

Given the two facts above, answer the question "Doing what has a positive impact on organisms and their habitat?" with the following options: 
- hydrate their cells
 - exercise
 - By coral exoskeletons
 - planting trees
 - trimming trees
 - planting grass
 - buying flowers
 - support


 

    planting trees     