Seed dispersal has a positive impact on a plant, and plants are the foundation of the ecosystem's food chain. Given these facts, what usually has a positive impact on an ecosystem's food chain among the following options:
- Jellyfish
 - mussels
 - invasive seeds
 - genetic diversity
 - seed dispersal
 - colony collapse
 - peachleaf willow
 - blossom end rot


 

     seed dispersal    