What is the key function of sphincters found along the digestive system? a. they selectively allow and stop passage of partially digested food. b. they control and direct the quantity of food passing through the digestive organs and prevent backward movement of partially digested food. c. they improve the muscular strength of the organs involved in digestion.

identify the dna change shown in the diagram and explain how that change can result in the increased genetic diversity often seen among siblings.identify the dna change shown in the diagram and explain how that change can result in the increased genetic diversity often seen among siblings.v

the farther away the object is from the central star (the sun) it's gravitainal pull on the object is weaker when it is farther

explanation: