Some aquatic animals like sponges feed on small particles of food suspended in water. This is called

Options

A. Swallowing
B. Scraping
C. Gnawing
D. Filter feeding.

Explanation

To solve the question regarding how some aquatic animals like sponges feed on small particles of food suspended in water, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Context**: The question mentions aquatic animals, specifically sponges, and their feeding habits. It is important to recognize that sponges are simple organisms that filter food from their environment.

2. **Identify the Feeding Mechanism**: The question asks for the term used to describe the feeding process of these animals. Sponges do not have a mouth or digestive system like more complex animals. Instead, they rely on a specific method to obtain their food.

3. **Evaluate the Options**: The options given are:
- A) Swallowing
- B) Creping
- C) Grain wing
- D) Filter feeding

4. **Analyze Each Option**:
- **Swallowing**: This implies taking in food through a mouth, which sponges do not have.
- **Creping**: This term does not relate to feeding in aquatic animals.
- **Grain wing**: This term is not recognized in the context of feeding mechanisms.
- **Filter feeding**: This is a known feeding strategy where organisms filter out small particles from the water.

5. **Select the Correct Answer**: Based on the analysis, the correct term for the feeding process of sponges, which involves filtering small particles from water, is **filter feeding**.

### Final Answer:
The process by which some aquatic animals like sponges feed on small particles of food suspended in water is called **filter feeding**.

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