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

Fact 2: Thus one important job the squirrel does in the ecosystem is to plant trees.

Given the two facts above, answer the question "What kind of effect does a squirrel have on the ecosystem?" with the following options: 
- Negative
 - Positive
 - adding heat
 - growth
 - food
 - Destructive
 - Powerful
 - support


 

  Positive       