What does mass extinction means?

Answer 1

Extinction is the complete disappearance of a species from life. No more of that species is alive on the planet. It happens all the time; the normal rate of extinctions is called the background extinction rate.

Mass extinction is when a group of extinctions significantly above the background rate occurs within a short space of time. The deifnition of 'significant' varies depending on the authority, and hence anywhere from five to over twenty mass extinctions have occurred on Earth in the known past - it is probable that more have happened, but this cannot be discerned from fossil and other records because of the size of the organisms involved.

Answer 2

When many species die out at once due to a large catastrophe, such as an asteroid impact of the depletion of atmospheric oxygen/carbon dioxide. event in which a large number of species go extinct over a short amount of time.

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Answer 3

It's when something ( asteroid, earthquake, natural disasters etc.) wipes out a whole population of animals. For example, imagine Africa had an earthquake that killed all living animals there, that would be mass extintion.

Answer 4

There have been many mass extinctions throughout the history of the Earth. Probably the most famous is the extinction that finally saw the end of the dinosaurs reign on the Earth, 65 million years ago. It wasn't just the dinosaurs that died out in this extinction.

Answer 5

Let's break it down. Tertiary was a time before dinosaurs when trilobites lived. Mass means a large portion. Extinction means no longer existant. So it means the extinction of a lot of Tertiary lifeforms.

Answer 6

"Extinct" is when a specific species dies off (say brown bears). "Mass extinction" is when an entire class of those animals dies (e.g. all bears.

Answer 7

it mean a wipe out of all the organisms in a group