Which two statements describe force? A. Force causes an object's motion to remain constant.
B. A force can have mass or weight.
C. Force is the ability to change an object's motion.
D. A force can be a push or a pull.

What does the positioning of transcription factors determine?

One of the reasons that stars are so large is because

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.