The correct sequence of development in a typical fluke life cycle is :

Options

A. egg, miracidium, cercaria, sporocyst
B. egg, miracidium, sporocyst, cercaria
C. egg, sporocyst, cercaria, miracidium
D. egg, cercaria, miracidium, sporocyst

Explanation

To determine the correct sequence of development in a typical fluke life cycle, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Fluke Life Cycle**: Flukes are parasitic worms that infect mammals. They typically enter the host through contaminated food or water.

2. **Initial Stage - Egg**: The life cycle begins with the fluke laying eggs. These eggs are passed out of the host's body through feces into the environment.

3. **Development of Miracidia**: Once in water, the eggs hatch into a larval stage called miracidia. This stage is free-swimming and seeks out a suitable intermediate host, often a snail.

4. **Formation of Sporocysts**: Inside the intermediate host, the miracidia develop into sporocysts. This stage is characterized by the sporocysts containing multiple larvae.

5. **Development into Rediae**: In some fluke species, sporocysts can develop into another larval stage called rediae. However, this stage is not present in all flukes.

6. **Formation of Cercariae**: The sporocysts or rediae then develop into cercariae, which are another free-swimming larval stage that eventually leaves the intermediate host.

7. **Adult Fluke**: Finally, the cercariae find a suitable definitive host (like a mammal), where they will mature into adult flukes, completing the life cycle.

### Correct Sequence:
The correct sequence of development in a typical fluke life cycle is:
- Egg
- Miracidia
- Sporocysts
- Cercariae

### Final Answer:
The correct sequence of development in a typical fluke life cycle is: **Egg → Miracidia → Sporocysts → Cercariae**.

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