The tricuspid valve shuts. This prevents blood from flowing backward into the right atrium while the ventricle contracts. So, your answer will be the Tricuslid Valve. Hope I helped!
C it will be c because earth has water
Answer:
It is made up of protons and neutrons
Answer:
initially by meiosis, then by mitosis( last choice)
Answer:
it benefits the thing or area it lives on?
