Question

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the graph indicates that density - dependent mechanisms affecting population growth may be a result of interactions between different

sources: data from d.a. maclulich, fluctuations in the number of the varying hare (lepus americanus), university of toronto press, 1937, reprinted 1974; photo ©ed cesar/science source.
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Explanation:

The graph shows the population dynamics of snow - shoe hare and Canada lynx, which is a classic example of predator - prey interaction. Density - dependent factors often involve such interactions between species in an ecosystem.

Answer:

Predator - prey species