Why selaginella is known as heterosporous ?

Explanation

### Step-by-Step Solution:

1. **Definition of Selaginella**:
- Selaginella is a type of plant that is characterized by its creeping growth form and simple, scale-like leaves. It is commonly referred to as a "lycophyte" and is part of a group known as "fern allies."

2. **Understanding Spores**:
- Plants can reproduce through spores, which are reproductive units. There are two main types of spore-producing plants: homosporous and heterosporous.

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