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umm:
First, do you know the first one you asked?
22west:
no
umm:
Then why ask a different one?
But I looked it up and got this:
'A. Oxpeker bird ticks off the back of zebras. A parasitism is where an organism must live on another living organism to survive. Another example would be where a bird cleans the teeth of an alligator for food. The organism can not survive without the help of another living organism'
Brainly - https://brainly.com/sf/question/2847723
22west:
ah
umm:
Which one do you think the second one is?
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22west:
c
umm:
Well I think more likely it's B, because B adds more food decreasing competition; he others would all increase competition.