Question

multiple - choice question
what do all of the mass extinctions have in common?
they involve massive increases in co₂
they result in polar ice melting
they occur in the northern hemisphere
they result from human activities

Explanation:

Mass extinctions are large - scale die - offs of species. Not all mass extinctions involve massive increases in CO₂, nor do they all result in polar ice melting. They are not limited to the northern hemisphere, and most pre - human mass extinctions occurred long before human activities. There is no single one of these factors common to all mass extinctions.

Answer:

None of the above options are correct.