How could stem cells prove in the treatment of cardiovascular diseases? a) stem cells can differentiate to form heart muscle cells. b) stem cells form white blood cells, which boosts the body’s immunity. c) stem cells divide to form red blood cells, which reduce hypertension. d) stem cells perform apoptosis to remove old cells from the heart muscles.

Each pair of clay balls represents two planetesimals. if each planetesimal is composed of the same material and is separated he the same distance, which pair experiences the frayed gravitational attraction?

Study the picture of the ocean. which is the best example of an organism’s niche shown in the picture? a. the environment contains several of the same species of coral. b. the shallow area of the ocean meets the needs of the coral and the fish. c. the ocean has fish and coral that live in the same area. d. the coral take in food from the water and provide shelter for the fish.

According to the cell theory, which describes cells? a. all organisms are composed of multiple cells. b. all cells have the same structure and function. c. cells are found in everything on earth. d. living organisms are not created spontaneously