C. is the answer because there us mutualism between both species.
Write a paragraph on the assigned topic. then echange 14 of the words you have already used for 14 of your assigned words. make sure they all make sense though. add sentances or extra words if necessary. also make sure that your words you are exchanging have at least a similar definition. im assuming this is a vocabulary assignment.
Answer:
<em>here's your answer!</em>
