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!
kinetic energy and potential energy i believe
Have a good day :)
Answer:
nucleotides
Explanation:
RNA and DNA are polymers made of long chains of nucleotides.
Answer:atom
Explanation:because it is defined as the smallest form of any given elemental item
Answer: 4. Problem solver
Explanation: you're working to fix a known problem
