EVOLUTION
EVOLUTION OF A POPULATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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When an organism dies off from Earth
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When multiple species or organisms die off from Earth
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A type of trait
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Detailed explanation-1: -A mass extinction is a short period of geological time in which a high percentage of biodiversity, or distinct species-bacteria, fungi, plants, mammals, birds, reptiles, amphibians, fish, invertebrates-dies out.
Detailed explanation-2: -This is known as the background rate of extinction. A mass extinction event is when species vanish much faster than they are replaced. This is usually defined as about 75% of the world’s species being lost in a ‘short’ amount of geological time-less than 2.8 million years.
Detailed explanation-3: -An extinction event (also known as a mass extinction or biotic crisis) is a widespread and rapid decrease in the biodiversity on Earth. Such an event is identified by a sharp change in the diversity and abundance of multicellular organisms.
Detailed explanation-4: -Based on evidence in the fossil record, scientists have identified major extinction events at the end of these geologic periods: Cretaceous Period-66 million years ago. Triassic Period-201 million years ago. Permian Period-252 million years ago.