This graph shows that paramecium B is the predator, and paramecium A is the prey. So, to figure this out, you have to look at two things: the populations, and when each paramecium was introduced to the beaker. Paramecium A is introduced at day 0. There’s a huge peak in the population of this paramecium over the next two days. Paramecium B is added on day 2.
Paramecium A’s population plummets over the next three days as paramecium B’s population slowly grows. By day 5, there’s no paramecium A left. Paramecium B survives for another day and a half before dying off. The only way this kind of graph could come around would be if paramecium B is eating paramecium A.
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