Which of the following statements regarding extinction is (are) correct?
i) only a small percentage of species is immune from extinction.
ii) extinction occurs whether humans interfere or not.
iii) extinctions can even be caused indirectly by humans.
a. only i
b. only ii
c. only iii
d. only ii and iii

The correct answer is option d, that is, only II and III.

Explanation:

Extinction is the term used in biology that signifies the cessation of a kind of organism or of a group of kinds, generally a species. Generally, extinction is considered as the moment in which the death of the last member of the species takes place, however, the tendency to breed and recover may have got lost before that.  

None of the species in the world is immune to the phenomenon of extinction. It can take place due to many factors like because of certain natural causes and also due to human interference. Some of the natural factors that can lead to the extinction of a species are climatic heating and cooling, changes in the level of sea or currents, cosmic or asteroids radiation, disease, and spread of invasive species.  

Some of the indirect causes of human interference that can lead to extinction are pollution, climate change or global warming. However, the natural factors generally take place at a gradual rate in comparison to human factors and thus lead to a lower extinction rate. Thus, the correct statements are II and III.  

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