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Prototherians have evolved from...

Prototherians have evolved from

A

Reptiles

B

Birds

C

Eutherians

D

Amphibians.

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Prototherians**: Prototherians are a group of mammals known for laying eggs, which distinguishes them from other mammals that give live birth. 2. **Identifying Characteristics**: Prototherians exhibit several characteristics that are similar to reptiles. For instance, they have a skeletal structure that resembles that of reptiles, and they possess a single opening for reproduction and excretion, which is a trait found in reptiles. 3. **Locomotion and Body Structure**: The limbs of prototherians are positioned on the sides of their bodies, which is a characteristic gait similar to that of reptiles. This positioning affects their movement and is another indicator of their evolutionary link to reptiles. 4. **Conclusion on Evolutionary Origin**: Given the similarities in anatomy and reproductive structures, it can be concluded that prototherians have evolved from reptiles. Therefore, the correct answer to the question is that prototherians have evolved from reptiles. 5. **Final Answer**: The correct option is **reptiles**. ---
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