Sam, who has type A blood wants to donate blood to his sister Mia, who has type O blood. Can he donate his blood to her? Why or why not? I need help please

As a small change in a person's dna can cause a genetic disorder

Which short-term environmental changes would a very small asteroid or comet impact on earth most likely cause? check all that apply. flooding extinction craters on surface changes in weather patterns death of organisms and populations

Is dna the same in every cell in the human body explain your answer