predation seed distribution competition seed fossilization
I gave my students this multiple choice question: Squirrels in cold climates gather and store food for winter. The squirrels sometimes bury nuts and then do not return for them. These nuts can grow to become trees. This chain of events is an example of

Only one answer is correct among these 4 choices:
- predation
- seed distribution
- competition
- seed fossilization

Could you tell me which one is correct?

seed distribution