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### Theory:

Our country is a home for various species and rich flora and fauna.
Flora is the plant life that occurs in a particular area.
Fauna is the animal life that occurs in a particular area.
Royal Bengal tigers, Asiatic lions and several birds are present in Indian forests. Due to environmental pollution, deforestation, habitat loss, human activities, hunting and poaching, many animal species are extinct and endangered. Some of the species doesn't exist any longer.
The species that no longer exists on the earth are called extinct species.
Extinct species can be plants or animals, and an animal that no longer exists on earth are called extinct animals. No member are living on the earth.
Example:
Dinosaurs and Dodos are extinct species that lived on the earth. Other examples include Caspian tigers, Irish deer, Passenger pigeons, Giant ground sloth and Cave lions.
Clockwise from top: Dinosaur, Mammoth elephant, Dodo, Passenger pigeon, Cave lion, Caspian tiger, Giant ground sloth
The species of animals or plants which are considered to be at the risk of extinction are called endangered species.
They exist in a small number, and there are only a very few of them left on the planet and soon that they might get extinct.
Important!
In India, $$132$$ species of plants and animals are critically endangered.
Example:
Snow leopards, Bengal tigers, Asiatic lions, purple frogs, and Indian giant squirrels are examples of endangered animals in India.
Many algae, fungi, bryophytes, ferns and the gymnosperms disappear with destruction of forest habitat. With each species getting disappeared, species that depend on them including animals and microbes disappear too as they depend on them for food and shelter.

Prawns, oysters, crabs, lobsters, octopuses, squids, cuttlefishes, dragonflies, beetles, fishes, grasshoppers and even the frogs are dying as they absorb poisonous gases through their skin. Locust is an insect that almost disappeared from India.