Which of these statements is not true with regard to the process of evolution? a. it has been observed in populations of living organisms. b. it is used to explain key similarities in organisms by all but a few scientists. c. it is a sudden change that causes species to become extinct. d. it explains the pattern of change in living organisms shown by the fossil record.

The correct answer is C. It is a sudden change that causes species to become extinct.

This answer is not correct because evolution occurs over a long period of time, as evidenced by the theories that describe its timeline (including gradualism and punctuated equilibrium). Additionally, evolution does not always involve the extinction of a species, but it can.

Hope this helps!

Hydrosphere is the correct answer