Which conclusion can be drawn from Gause's experiments on interspecific competition between two species of
Paramecium that are cultured together and feed on the same resource?
a. Both populations of Paramecium expire due to a build-up of waste products.
b. One population of Paramecium used the other as a food source.
c. Paramecium populations survive well together because they have no limiting resources.
d. When two populations of Paramecium use the same limiting resource, they can coexist long term.
e. When two populations of Paramecium use the same limiting resource, they cannot coexist long term.
ANSWER: e
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