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How do crustaceans differ from insects?

Crustaceans and insects are both arthropods, but they have several key differences:

1. Habitat:

- Crustaceans are mostly aquatic and live in water (e.g., crabs, lobsters, shrimp).

- Insects are mostly terrestrial and live on land (e.g., ants, butterflies, grasshoppers).

2. Breathing:

- Crustaceans use gills to breathe underwater.

- Insects breathe through a tracheal system, which is a network of tiny tubes that carry air directly to their body tissues.

3. Antennae:

- Crustaceans have two pairs of antennae.

- Insects have one pair of antennae.

4. Body Structure:

- Crustaceans often have a body covered with a hard shell and may have many segments.

- Insects have three main body parts: head, thorax, and abdomen.

These differences help each group survive in their specific environments—crustaceans in water and insects on land.