Question

Read the statements below.

1. It is common.

2. It only occurs during natural disasters.

3. It only occurs when there are a few members of a species remaining on the earth.

Which statement is true about extinction?


2 only


2 and 3


1 only


1 and 3

Answer 1

1 only

Explanation: Extinction is a common natural process over geological time (most species that have ever lived are now extinct). It does not occur only during natural disasters, nor only when a species' numbers are already very small — many causes (habitat loss, disease, competition, human activity, sudden catastrophes) can lead to extinction.