That was correct. it was letter choice b
I would say commensalism since one organism benefits (the seeds) and the other other is neither benefited nor harmed
Answer:
A few examples could be an increase in food, an increase in shelter, a decrease in predators, or more land.
If the web happened to look like this one I attached then the anwser would be shrubs. If you take a look at the arrows the shrubs energy is moving to rats, insects and lizards which in turn feeds the coyotes. The starting point is shrubs and in general most food webs start with plants.