Answer:
D) four.
Explanation:
The two atria hold the blood that circulates away from the heart. The heart has four one-way valves, which open and close with each heartbeat. The tricuspid valve and the mitral valve are located between the atria and allow the blood to flow from the atria to the ventricles. Also you don't have to but mind marking Brainliest?
I would advise you do more research on .gov websites. But I don't believe they will take anything other than a State I.D.
Answer:
You need to have an idea, a topic for your research project – this topic could be something that comes to you as a result of your coaching practice, reading literature on the subject, talking to colleagues or a combination of all three. Be clear about the aims or your research, and the rationale for carrying it out. identifying the right research topic, research question(s) and methodology are key to a successful research project. Do not underestimate the time and resources required for completing your work.
Explanation:
