Answer:Oxygen-rich blood flows from the lungs back into the left atrium (LA), or the left upper chamber of the heart, through four pulmonary veins. The Oxygen-rich blood then flows through the mitral valve (MV) into the left ventricle (LV), or the left lower chamber.
Answer:
Demography
Consequences of population growth
Explanation:
Demography : It is the study of population and deals with the measurement and analysis of birth rate.
Consequences of population growth: Rapid population grow directly affects economic, social and environmental aspects of a place.
Answer: By having variety in what you eat, you give your body a balanced amount of different properties your food has.
Explanation:
Heart rate is your answer
