Answer:
mutualism is the relationship between two organisms where both organism benefit one another for example, a bee collects nectara from flowers while at the same time, the bee helps to pollinate the pollen in the flower.
parasitism is when an organism benefit at the expense of the other organisms.For example, a parasite obtains it food by absorbing its food and nutrients from another organism which is the host this can happen to both plants or animals.
commensalism is the relationship between two organism where one organism benefits while the other organism derives with either benefit nor harm.
for example, a bird forms it's nest on a tree, the tree derives with neither benefit not harm whereas the bird have a nice nest to sleep and lay eggs on.