What is the difference between flora, fauna and vegetation? Eichhornia crassipes is called as an exotic species, while Rauwolfia is an endemic species in India. What do these terms exotic and endemic refer to ?

Explanation

### Step-by-Step Solution:

1. **Understanding Flora, Fauna, and Vegetation:**
- **Flora:** This term refers to all the plant species or plant life found in a specific region at a given time. It encompasses all types of plants, including trees, shrubs, herbs, and grasses.
- **Fauna:** Similar to flora, fauna pertains to all the animal species found in a particular area at a specific time. It includes all types of animals, from mammals to birds, insects, and more.
- **Vegetation:** This term is used to describe the plant forms present in a region, such as grasses, shrubs, and trees. Unlike flora, vegetation does not focus on specific taxonomic classifications or botanical characteristics.

2. **Differences Between the Terms:**
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