Spiral and determinate type cleavage is present in:
Correct answer: A. Pinworm
- A. Pinworm
- B. Starfish
- C. Cake urchin
- D. Amphioxus
Explanation
Spiral and determinate cleavage is a feature of protostomes, a group that includes organisms such as annelids, mollusks, and nematodes. Pinworms, being nematodes, fall into this category and exhibit this type of embryonic development. In contrast, starfish, cake urchins, and amphioxus are deuterostomes, which are characterized by radial and indeterminate cleavage. This fundamental difference in early developmental stages is key to differentiating between these two major groups of animals.
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