<span>The answer to this question would be: keep blood moving forward through the heart
When the ventricle contracts, the valve will plug the hole to atrium so the blood will be pump to the body. The valve in heart will prevent backflow of blood from ventricle to atrium which makes the blood keep moving forward.
A defect in valve could reduce heart deficiency as a part of the blood might be going back to the atrium, called regurgitation.</span>
Mutations lead to variation by producing changed in the genetic code
Answer:
either the first one lactic acid fermentation or the third one alcoholic fermentation
<span>It would not kill bacteria because bacteria do not have a nucleus, so there are no nuclear pores to be blocked.</span>
Answer:
Rods are sensative to bright light
Explanation:
Rodes are important for being able to see darkness, while Cones are importnat for seeing colors.