a. Mutations are rare events.
b. All mutations are harmful.
c. Some mutations can be contagious, like infections.
d. Mutations are not passed from parent to offspring.
Answer:- a. Mutations are rare events.
The correct answer is ‘Mutations are rare events.’ They occur about 1 in 10,000 times when DNA is replicated. However, the rate of mutation can increase if an organism is exposed to certain chemicals or radiation. Mutations are rare events. They occur about 1 in 10,000 times when DNA is replicated. However, the rate of mutation can increase if an organism is exposed to certain chemicals or radiation.