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Among the following organisms, () A. Frog B. Silkworm C. Swallow D. Family.
The main characteristics of mammals are viviparous and lactation. Option d rabbits have viviparous and lactation. Option A Frog Amphibians, B Silkworm Arthropods and C Swallows belong to birds. All three reproduction methods are oviparous, which does not meet the question.

So choose: D.

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