What are examples of mutalism, commensalism and parasitism in the grasslands?

This is outside of my area of expertise, but try googling "grasslands parasitism"

Let me google that for you (http://www.lmgtfy.com/?q=grasslands+parasitism)

You primarily need to know what are meant by mutalism, commensalism and parasitism.

Mutualism refers to a pair of organisms living together, whereby both are benefiting each other.

Commensalism refers to a pair of organisms living together, whereby one is being benefitted, and the other not the least affected by the activities of the one benefiting.

Parasitism refers to a pair of organisms living together, whereby one benefits and harms in a certain way the other organism.

The pair usually composes of a large organism and a smaller one.

Try posting your suggestions to your answer. I hope that my definitions helped :)