Urinary bladder is absent in

Options

A. Fishes
B. Snakes
C. Crocodiles
D. All the above

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the absence of the urinary bladder in certain animals. The urinary bladder is an organ that stores urine before it is excreted from the body.

2. **Identifying the Options**: The options provided are:
- A) Fishes
- B) Snakes
- C) Crocodiles
- D) All of the above

3. **Analyzing Each Option**:
- **Fishes**: Most fish do not have a urinary bladder. Instead, they excrete ammonia directly into the water, which is a less energy-intensive process.
- **Snakes**: As reptiles, snakes also lack a urinary bladder. They excrete waste through a structure called the cloaca, which serves multiple functions.
- **Crocodiles**: Similar to snakes, crocodiles are reptiles and also do not possess a urinary bladder. They too utilize the cloaca for excretion.

4. **Understanding the Cloaca**: The cloaca is a common opening for excretion, digestion, and reproduction. This means that both solid and liquid wastes are expelled through this single opening, eliminating the need for a urinary bladder.

5. **Conclusion**: Since all three groups mentioned (fishes, snakes, and crocodiles) do not have a urinary bladder, the correct answer is option D) All of the above.

**Final Answer**: The urinary bladder is absent in all of the above (fishes, snakes, and crocodiles).

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