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In deuterostomes second opening forms...

In deuterostomes second opening forms

A

Anus

B

Mouth

C

Nose

D

Bo th A and B

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Terms**: First, we need to understand what deuterostomes are. Deuterostomes are a group of animals characterized by their embryonic development. In these organisms, the first opening that forms during embryonic development becomes the anus. 2. **Comparing with Protostomes**: In contrast, protostomes are another group of animals where the first opening that forms becomes the mouth. This distinction is crucial in understanding the development of these two groups. 3. **Formation of Openings**: In deuterostomes, after the anus is formed from the first opening, the second opening that develops will become the mouth. This is the key point in the question. 4. **Identifying the Correct Answer**: Given the options provided (mouth, nose, or both a and b), we can conclude that the second opening in deuterostomes specifically forms the mouth. 5. **Final Answer**: Therefore, the correct answer to the question "In deuterostomes, the second opening forms" is **mouth**. ---
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