I think the answer is C but i am sorry if i am wrong i took this test but i am pretty sure it is C have a good day and good luck on the test
Answer:
Here let me help you, DNA influences physical traits by changing how you look, sound, and function. Your parents transfer their genes into you which means you are left with characteristics of there body, such as having your father's nose. Hope this helped.
Explanation:
No caffein,there is a factor that must not be changed when conducting an experiment,known as controlled variable
