Which one of the following groups consists of hermaphrodite organisms?

Options

A. Leech, tapeworm, hydra
B. Earthworm, tapeworm, roundworm
C. Earthworm, starfish, turtle
D. Leech, nereis, roundworm

Explanation

To determine which group consists of hermaphrodite organisms, we need to analyze the options provided and understand the concept of hermaphroditism.

### Step-by-Step Solution:

1. **Understand Hermaphroditism**:
- Hermaphrodite organisms possess both male and female reproductive organs. They can produce both sperm and eggs, allowing them to mate with any individual of their species.

2. **Analyze the Options**:
- **Leech**: Leeches are hermaphrodites as they have both male and female reproductive organs. However, they are not self-fertilizing.
- **Tapeworm**: Tapeworms are also hermaphrodites and can self-fertilize, meaning they can fertilize their own eggs.
- **Hydra**: Hydra can be hermaphroditic or can have separate sexes. This means they can exhibit both hermaphroditic and dioecious (separate sexes) characteristics.
- **Earthworm**: Earthworms are true hermaphrodites, possessing both reproductive organs and typically engage in cross-fertilization.
- **Roundworm**: Roundworms are generally dioecious, meaning they have distinct male and female individuals.
- **Starfish**: Starfish can change sexes throughout their lifetime, making them sequential hermaphrodites, but they are not true hermaphrodites.
- **Turtle**: Turtles are not hermaphrodites; they have distinct male and female individuals.
- **Nereis**: Nereis (a type of polychaete worm) is also not hermaphroditic; they have separate sexes.

3. **Identify the Groups with Hermaphrodites**:
- From the analysis, leeches, tapeworms, and earthworms are confirmed hermaphrodites. Hydra can be considered as well since it can exhibit hermaphroditic characteristics.

4. **Conclusion**:
- The groups that consist of hermaphrodite organisms are leech, tapeworm, and hydra.

### Final Answer:
The correct answer is: **Leech, Tapeworm, Hydra**.

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