We are working on a project in class about grasslands in North America... I'm stuck as to what the mutualism and the commensalism are. Is there anyone that can answer this for f because I'm stumped. And also can you give me some examples.. you really won't be giving me the answer to the question I just need something to look at so that I can work off that. I also need to know what exactly parasitism means.

Hello chel_z

That question has been posted before on this board (LINK). Have a look! (https://www.askmehelpdesk.com/ecology-environment/symbiosis-grasslands-143174.html)

And another nice explanation can be found in this second LINK. (http://209.85.129.132/search?q=cache:tj7mEgUYVBYJ:itech.pjc.edu/jwooters/env/chapter%25206.2ed.rtf+grasslands+North+America+mut ualism+commensalism&cd=5&hl=en&ct=clnk&gl=nl)