Answer: Septum
In short, your answer is choice C
Hope this helps!
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!
It can help determine the quelity and safety of water. This can be a good deciding factor of choosing between tap vs bottled water. If the rating is too bad you should choose to use bottled water
B, the independent variable because this is the one that is purposefully changed in an experiment to test the hypothesis.
