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Which one of the following groups of animals reproduces only by sexual means?

1. Ctenophora
2. Cnidaria
3. Porifera
4. Protozoa

Correct answer: Ctenophora

Solution

Ctenophores are generally considered to reproduce only sexually, producing gametes rather than using asexual methods. In contrast, cnidarians and poriferans commonly show asexual reproduction, and protozoa often reproduce by fission.

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