Water enters into spongocoel through

Options

A. osculum
B. choanocytes
C. ostia
D. madreporite

Answer

**Step-by-Step Solution:**

1. **Understanding the Structure of Sponges**: Sponges are simple aquatic animals characterized by a porous body structure. They have a central cavity called the spongocoel.

2. **Identifying the Water Entry Points**: Water enters the spongocoel through numerous small openings on the sponge's surface. These openings are known as "ostia" (singular: ostium).

3. **Function of Ostia**: The ostia allow water to flow into the spongocoel, which is essential for the sponge's feeding, respiration, and waste removal processes.

4. **Water Exit Point**: After circulating through the spongocoel, the water exits the sponge through a larger opening called the osculum.

5. **Conclusion**: Therefore, the correct answer to the question "Water enters into spongocoel through" is "ostia."

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