Birds possess

Options

A. right ovary
B. left systemic arch
C. urnary bladder
D. None of these

Answer

To answer the question "Birds possess," we will analyze the given options one by one to determine which is correct.

### Step-by-Step Solution:

1. **Evaluate the First Option: Right Ovary**
- In birds, the right ovary is absent. Only the left ovary is functional. Therefore, this option is incorrect.

2. **Evaluate the Second Option: Left Systemic Arch**
- Birds do not have a left systemic arch; instead, they possess a right systemic arch. The left systemic arch is characteristic of mammals. Thus, this option is also incorrect.

3. **Evaluate the Third Option: Urinary Bladder**
- Birds lack a urinary bladder. They excrete nitrogenous waste in a different form, which does not require a bladder for storage. Therefore, this option is incorrect as well.

4. **Conclusion: None of These**
- Since all the previous options (right ovary, left systemic arch, and urinary bladder) are incorrect, the only remaining option is that birds possess none of these.

### Final Answer:
Birds possess none of these.

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