Metanephros kidney occurs in
(a) Amniotes
(b) Fishes
(c) Amphibians
(d) Invertebrates

Options

A. Amniotes
B. Fishes
C. Amphibians
D. Invertebrates

Answer

To solve the question regarding the occurrence of metanephros kidneys, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Metanephros**:
- The metanephros is a type of kidney that develops from the posterior part of the nephrotome. It is a well-differentiated kidney with specialized structures known as nephrons.

2. **Identifying Organisms**:
- We need to determine which of the given groups of organisms possess metanephric kidneys. The options are:
- (a) Amniotes
- (b) Fishes
- (c) Amphibians
- (d) Invertebrates

3. **Analyzing Each Option**:
- **Option (a) Amniotes**:
- Amniotes are organisms that lay eggs with an amnion membrane, which protects the embryo. This group includes reptiles, birds, and mammals. They possess metanephric kidneys.
- **Option (b) Fishes**:
- Fishes typically have a different type of kidney called the pronephros or mesonephros, not metanephros.
- **Option (c) Amphibians**:
- Amphibians also do not have metanephric kidneys; they usually have mesonephric kidneys during their larval stage.
- **Option (d) Invertebrates**:
- Invertebrates do not possess metanephric kidneys; they have various other forms of excretory systems.

4. **Conclusion**:
- Based on the analysis, the only group that possesses metanephric kidneys is **(a) Amniotes**.

### Final Answer:
The correct answer is **(a) Amniotes**.