Which of the following animals undergoes rotational cleavage?Group of answer choicesmammalsamphibiansannelidsreptilesechinoderms

To determine which of the listed animals undergoes rotational cleavage, we first need to understand what rotational cleavage is. Rotational cleavage is a type of embryonic development that occurs after the fertilization of an egg, where the first cleavage divides the zygote into two cells, and subsequent cleavages are not symmetrical.

1. Mammals - Mammals, particularly the more derived ones, exhibit rotational cleavage during early embryonic development.
2. Amphibians - Amphibians such as frogs typically do not undergo rotational cleavage; they exhibit a different cleavage pattern known as radial cleavage.
3. Annelids - Annelids, like earthworms, also do not display rotational cleavage but show determinate cleavage.
4. Reptiles - Similar to amphibians, reptiles usually do not undergo rotational cleavage but exhibit discoidal cleavage due to their egg structure.
5. Echinoderms - Echinoderms (e.g., starfish) typically undergo radial cleavage.

Conclusion

Based on these definitions, the correct answer is mammals, as they are known to undergo rotational cleavage during their early embryonic development stages.