Which of the following sets of animals produce the same substance as their chief excretory product?
(a) Camel, housefly, and snake
(b) Fish, pigeon, and frog
(c) Amoeba, ant, and antelope
(d) Frog, monkey, and dog

Options

A. Camel, housefly, and snake
B. Fish, pigeon, and frog
C. Amoeba, ant, and antelope
D. Frog, monkey, and dog

Answer

To determine which set of animals produces the same substance as their chief excretory product, we need to analyze the excretory products of the animals in each option.

### Step-by-Step Solution:

1. **Understand Excretory Products**: Different animals have different excretory products based on their habitat and physiology. The primary nitrogenous wastes are urea, uric acid, and ammonia.

2. **Analyze Each Option**:
- **Option (a)**: Camel, housefly, and snake
- Camel excretes urea.
- Housefly excretes uric acid.
- Snake excretes uric acid.
- **Conclusion**: They do not produce the same substance.

- **Option (b)**: Fish, pigeon, and frog
- Fish excretes ammonia.
- Pigeon excretes uric acid.
- Frog excretes urea.
- **Conclusion**: They do not produce the same substance.

- **Option (c)**: Amoeba, ant, and antelope
- Amoeba excretes ammonia.
- Ant excretes uric acid.
- Antelope excretes urea.
- **Conclusion**: They do not produce the same substance.

- **Option (d)**: Frog, monkey, and dog
- Frog excretes urea.
- Monkey excretes urea.
- Dog excretes urea.
- **Conclusion**: They all produce urea as their chief excretory product.

3. **Final Conclusion**: The correct answer is **(d) Frog, monkey, and dog**, as they all excrete urea.