You are presented with the question "What usually has a positive impact on an ecosystem's food chain?" and the following answer choices: 
- Jellyfish
 - mussels
 - invasive seeds
 - genetic diversity
 - seed dispersal
 - colony collapse
 - peachleaf willow
 - blossom end rot

Now knowing that seed dispersal has a positive impact on a plant and plants are the foundation of the ecosystem's food chain, choose the best answer.


 

     seed dispersal    