What are spiracles? Name one animal in which they are present.

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Spiracles**: Spiracles are specialized respiratory organs found in certain animals. They serve as external openings that allow air to enter the respiratory system.

2. **Location of Spiracles**: In insects, such as cockroaches, spiracles are located on the sides of the abdomen. This positioning helps facilitate the intake of air directly from the environment.

3. **Function of Spiracles**: Spiracles are connected to a network of tracheal tubes. These tubes transport air from the spiracles to the cells of the organism, allowing for gas exchange necessary for respiration.

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