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

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Flora	Fauna	Vegetation
The sum of plant species in a given geographical area is called the flora of that area.	The sum of animal species in a given geographical area is called the fauna of that area.	It refers to the ground cover provided by plants in a given area, often used for a much wider geographical scale than a particular ecosystem.

$Endemic$ $species$: $A$ species that is found naturally only in a particular geographical area is called an endemic species for that area. For example, $Rauwolfia$ $serpentina$ is found naturally only in India; therefore, it is an endemic species in India.
$Exotic$ $species$: $A$ species that is not naturally found in a particular area but is present due to human introduction or importation is called an exotic species. For example, $Eichhornia$ $crassipes$ is native to other countries but was introduced to India; therefore, it is an exotic species in India.