AP BIOLOGY

EVOLUTION

PATTERNS OF EVOLUTION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What is a mass extinction?
A
When all the species in a particular area on earth suddenly go extinct
B
When multiple species from all over the earth suddenly go extinct
C
When one species goes extinct due to habitat changes
D
When all life on earth is wiped out
Explanation: 

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: -These are called mass extinctions, when huge numbers of species disappear in a relatively short period of time. Paleontologists know about these extinctions from remains of organisms with durable skeletons that fossilized.

Detailed explanation-4: -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.

There is 1 question to complete.