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?
Life expectancy has increased steadily during the past six thousand years by 1.4%
The right option is C. Listing the consequences of each option.
Explanation :
Consequences can be both negative and positive. Pros are the positive factors of something while cons are the negative ones.
The pros and cons of something are its advantages and disadvantages, which you consider carefully so that you can make a sensible decision.
Making pros and cons list is a method which is used very often by the people of all professions.
