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In laboratory experiments, two species of the protist Paramoecium were grown alone and in the presence of the other species. The following graphs show growth of species 1 (left) and species 2 (right), alone and when in mixed culture.             Interpretation of these graphs shows that:

A) competitive exclusion occurred in the these experiments.

B) both species are affected by interspecific  competition but species 1 is less affected.

C) both species are affected by interspecific competition but species 2 is less affected.

D) both species are affected equally by interspecific competition.