Answer: <u><em>D. An observation that has a number associated with it</em></u>
Explanation: The answer is D. An observation that has a number associated with it. I would explain further, but it is pretty self explanatory.
<em>Good luck!</em>
Mutation is the only evolutionary mechanism that does little to change allele frequencies.
Genetic engineering because the genes of the plants were modified
A minimum point used for comparison i think
