Please help. I will mark you as brainliest and give you points :)

A hummingbird feeding: Mutualism

Explain Interaction: The hummingbird drinks the nectar from the flower and the hummingbird may help pollinate the flower.

I'm a bit confused by the plants on the floor one.

Plants on a Forest Floor: Competition

Explain Interaction: The plants on the forests floor compete with each other for the same resources. Both may not receive enough of those resources. Note: When I was around Middle School and High-school I was only taught mutualism, commensalism, and parasitism, so let me know if competition is not a choice your teacher gives you to choose from or wasn't taught to you

Flea bites human: Parasitism

Explain Interaction: The flea drinks the persons blood as food and the person is hurt. Flea bites can be itchy and become painful. Fleas may also also carry disease.

Clownfish in Anemone: Mutualism (although I hear some people say commensalism)

Explain Interaction: The anemone provides protection and a place to live for the clownfish. The anemone may eat bits of food left over from the clownfish.

I think the answers Lithium..