Some Portions of DNA Function as a Kind of Evolutionary

question 7

Multiple Choice

Some portions of DNA function as a kind of evolutionary clock when comparing two different species because _____.

• A) portions of the DNA have no function
• B) mutations accumulate at a known rate
• C) changes to DNA always occur quickly and easily
• D) organisms change their anatomy at a constant rate
• E) no mechanism is available for removing mutations that are harmful