Urea excreting meta nephric kidneys found in

Options

A. Ichthyopsids
B. Sauropsids
C. Hairy homeotherms
D. All homeotherms

Answer

**Step-by-Step Solution:**

1. **Understanding Metanephric Kidneys**:
- Metanephric kidneys are a type of kidney that develops from the embryonic intermediate mesoderm. They are the most advanced form of kidneys and are primarily responsible for the excretion of urea.

2. **Identifying Organisms with Metanephric Kidneys**:
- Metanephric kidneys are found in higher vertebrates, particularly in mammals and some reptiles. They are crucial for the excretion of urea, which is a nitrogenous waste product.

3. **Analyzing the Options**:
- **Ichthyopsis**: This group consists of jawless fishes that primarily excrete waste through their gills. They do not possess metanephric kidneys.
- **Sauropsis**: This class includes reptiles. While they do develop metanephric kidneys as adults, they also have mesonephric kidneys during their larval stages.
- **Hairy Homeotherms**: This term refers to mammals, which maintain a constant body temperature and possess metanephric kidneys that excrete urea.
- **All Homeotherms**: This category includes both mammals and birds, but it also encompasses organisms with mesonephric kidneys, which do not exclusively excrete urea.

4. **Conclusion**:
- The correct answer is **hairy homeotherms** (mammals), as they are the organisms that possess metanephric kidneys and excrete urea.

**Final Answer**: Urea excreting metanephric kidneys are found in hairy homeotherms (mammals).

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