Where in the alimentary canal of earthworm grinding occurs?

Explanation

To determine where grinding occurs in the alimentary canal of an earthworm, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Structure of the Alimentary Canal**: The alimentary canal of an earthworm is a long, straight tube that runs from the mouth to the anus. It consists of several segments, each serving a specific function in digestion.

2. **List the Parts of the Alimentary Canal**: The main parts of the alimentary canal include:
- Mouth
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