Question

question 17
4 pts
which of the following is true about the extinction of species?
use lowercase letters : write true or false

1. very few species have ever become extinct. most continue to exist.
2. there have been extinction events in which many species became extinct at about the same time. aside from these, extinction is very rare.
3. up until recently, species rarely became extinct. humans have caused the majority of extinctions.
4. many species have become extinct throughout the history of life on earth.

Explanation:

1. Fossil records show over 99% of all species that ever lived are extinct, so this is false.
2. Background extinction (ongoing low-level extinction) occurs between mass extinctions, so extinction is not rare outside mass events. This is false.
3. Extinction was a regular, ongoing process long before human activity; humans have accelerated it but not caused the majority of all extinctions. This is false.
4. Fossil evidence confirms that countless species have gone extinct throughout Earth's evolutionary history, including both background and mass extinctions. This is true.

Answer:

1. false
2. false
3. false
4. true