Fact 1: Seed dispersal has a positive impact on a plant.

Fact 2: Plants are the foundation of the ecosystem's food chain.

Given the two facts above, answer the question "What usually has a positive impact on an ecosystem's food chain?" with the following options: 
- Jellyfish
 - mussels
 - invasive seeds
 - genetic diversity
 - seed dispersal
 - colony collapse
 - peachleaf willow
 - blossom end rot


 

     seed dispersal    