Which of the following animals does not have muscles for movement?

Options

A. Earthworm
B. Snail
C. Bird
D. none of these

Explanation

To determine which of the following animals does not have muscles for movement, we can analyze the options provided:

1. **Earthworm**: Earthworms have both circular and longitudinal muscles. These muscles allow them to move through the soil by contracting and relaxing, which helps them to elongate and shorten their bodies. Therefore, earthworms do have muscles for movement.

2. **Snail**: Snails also possess muscles that aid in their movement. They use a muscular foot to creep along surfaces, allowing them to move effectively. Hence, snails have muscles for movement as well.

3. **Birds**: Birds have muscles that are integral to their movement. These muscles are attached to their wings and body, allowing them to fly and move around. Thus, birds definitely have muscles for movement.

Since all the mentioned animals (earthworm, snail, and bird) have muscles that facilitate movement, the correct answer to the question is:

**None of these animals do not have muscles for movement.**

### Step-by-Step Solution:
1. Identify the animals listed in the question.
2. Analyze the movement mechanism of each animal:
- Earthworm: Has circular and longitudinal muscles for movement.
- Snail: Uses a muscular foot for locomotion.
- Birds: Have muscles for flying and movement.
3. Conclude that all the animals listed have muscles for movement.
4. Therefore, the answer is that none of these animals do not have muscles for movement.