What is background extinction?
7.2 Biodiversity Loss and Extinction

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Science
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9th - 12th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
The extinction of a species one by one, rather than a sudden loss of many species.
2.
FLASHCARD QUESTION
Front
What does it mean when a species is classified as 'threatened'?
Back
It means they are likely to become endangered.
3.
FLASHCARD QUESTION
Front
How many mass extinctions have occurred on Earth?
Back
There have been 5 mass extinctions.
4.
FLASHCARD QUESTION
Front
Approximately how long ago did dinosaurs become extinct?
Back
Dinosaurs became extinct about 65 million years ago.
5.
FLASHCARD QUESTION
Front
What is the primary source of knowledge about early life on Earth?
Back
Most of what we know of early life comes from fossils.
6.
FLASHCARD QUESTION
Front
What is mass extinction?
Back
A rapid and widespread decrease in the biodiversity on Earth, resulting in the extinction of a large number of species in a relatively short period.
7.
FLASHCARD QUESTION
Front
What is the difference between background extinction and mass extinction?
Back
Background extinction occurs gradually over time, while mass extinction happens suddenly and affects a large number of species.
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