Which of the following conclusions is best supported by the results of the experiment?
(A) Neither population grows as large when cultured together as each does when cultured separately.
(B) P. caudatum prefers different food when cultured with P. aurelia than when cultured separately.
(C) Competition for mates increases when the species are cultured together compared with when they are cultured separately.
(D) Individuals of the species P. caudatum are smaller when cultured together with P. aurelia than when cultured separately.
Answer: (A) Neither population grows as large when cultured together as each does when cultured separately.
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