NEET BIOLOGY

Detailed explanation-1: -Entire species permanently disappear from the biosphere when the last member of the species dies in a process called extinction. Many species have become extinct and paleontologists study fossils of those extinct species. The gradual process of species becoming extinct is known as background extinction.

Detailed explanation-2: -The gradual process of species becoming extinct is known as background extinction.

Detailed explanation-3: -A species is said to be extinct when it no longer lives anywhere on the planet. Extinction occurs when the last members of a species die because they cannot acquire the food, water, shelter, and/or space necessary to survive.

Detailed explanation-4: -Background extinction rate, or normal extinction rate, refers to the number of species that would be expected to go extinct over a period of time, based on non-anthropogenic (non-human) factors.

Detailed explanation-5: -In nearly all comparisons of modern versus background extinction rates, the background rate has been assumed to be somewhere between 0.1 and 1 species extinction per 10, 000 species per 100 years (equal to 0.1 to 1 species extinction per million species per year, a widely used metric known as E/MSY).