Which best describes somatic mutations?
a. they are usually passed on to offspring.
b. they can cause different kinds of cancer.
c. they always result from point mutations.
d. they only occur in reproductive cells.

Somatic mutations are genetic mutations. The best answer is b. they can cause different types of cancer. Somatic mutations do not only occur in reproductive cells. Mutations that occur only in reproductive cells are known as germ line mutations. Somatic mutations are mutations that occur after conception. They are mutations in the DNA structure. They can cause cancer but are not always cancer causing. They are often caused by exposure to environmental factors including ultraviolet radiation and exposure to certain chemicals. 

It is evolution, because we all have some of the same traits like eye color or shape or ears.