Describe the type of community interaction occurring in each of the following cases.

a. A buffalo eats some grass
b. A sea anemone is a marine organism that feeds on fish. It captures its prey using stinging cells. The clownfish (made famous in the movie Finding Nemo) is immune to the stinging cells and can therefore hide from predators inside the sea anemone. When the clownfish urinates, it provides nitrogen (a necessary nutrient) to the sea anemone.