Question

Use the diagram to identify the four regions of the earthworm.

Dorsal side:

Ventral side:

Anterior end:

Posterior end:

Answer 1

To identify the four regions of the earthworm based on its anatomy, you can consider the following:

1. **Dorsal side:** This is typically the upper side of the earthworm, characterized by a darker coloration. The dorsal side is where you can find the earthworm's clitellum (if present), which is a thickened, glandular section involved in reproduction.

2. **Ventral side:** The ventral side is the lower side of the earthworm, which is usually lighter in color. This side contains the mouth at the anterior end and is where the earthworm's segments are more pronounced.

3. **Anterior end:** The anterior end refers to the head end of the earthworm, where the mouth is located. It is typically more pointed compared to the posterior end and may have sensory structures.

4. **Posterior end:** The posterior end is the tail end of the earthworm, which is usually more rounded. It does not have significant sensory structures and is where the anus is located.

These terms help in understanding the orientation and structure of earthworms which are important for their movement and feeding behavior.