Biology: Which of the following statements about mass extinction is FALSE?

a. Evidence indicates that geological and weather changes are a factor.





b. Mass extinction occurs when a large number of species become extinct.





c. Mass extinction occurred only at the end of the Ordovician period.





d. Human activities are a contributing factor.














Which one is it? Can you help? Thanks!Biology: Which of the following statements about mass extinction is FALSE?
I think C is false. Extinctions occur in all periods of time, and it's even happening today.





VIVA LA RAZA!Biology: Which of the following statements about mass extinction is FALSE?
i think its C.


because dinosaurs extincted due to geological factor.


when a large number of species become extinct like most of the animals during a lava eruption on an island


Human activities are a contributing factor because Tasmania tiger and panda are endanger species due to humans
C is false.





There have been many mass extinctions in the history of life on earth. The greatest was when photosynthetic bacteria introduced Oxygen gas into the atmosphere. It poisoned nearly 95% of everything else on earth.
c .i think mexicanboy18 is right. mass extinction is happening in Africa because some freaks keep cutting down trees and a lot of species have gone homeless!
C
c is false
I am guessing for this one C?
is it C?