Which of the following statements is correct regarding the structure represented by x

Write a paragraph at least 5 sentences “why all vaccinations should be mandatory”

Plz ! a scientist wants to produce a cow that makes a particular human protein in it’s milk the desired protein causes blood to clot and can be used to treat hemophilia (a blood clotting disorder). which of the following would be best for the scientist to use? a. genetic crosses. b. cloning. c. selective breeding. d. genetic engineering.

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.