Answer:
I would say B
Explanation:
Because atural selection is the mechanism for how evolution occurs over time. Basically, natural selection says that individuals within a population of a species that have favorable adaptations for their environment will live long enough to reproduce and pass down those desirable traits to their offspring.
I think the correct answer would be A. The yolk sac becomes the placenta. It is membranous sac that is attached to the embryo. It provides all the nutrition and the blood cells needed by the embryo. It is also called the umbilical vesicle.
I believe that it's called an adaptation.
Hope I helped you
DNA is something everyone has in them to see
I would say it is unethical becuase many young children can't tell when they are being marketed to and you should focus marketing to the kids parents.
