Write one function of endomycorrhiza.

Explanation

**Step-by-Step Solution:**

1. **Define Mycorrhiza**: Mycorrhiza refers to the mutual symbiotic association between fungi and plant roots. This relationship is beneficial for both organisms.

2. **Types of Mycorrhiza**: There are two main types of mycorrhiza: ectomycorrhiza and endomycorrhiza.
- Ectomycorrhiza forms a net around the root cortex cells.
- Endomycorrhiza penetrates the root cells and forms structures called arbuscules.

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