Answer:
A chronic disease is a disease that comes and becomes more stronger overtime like cancer and it takes time to take effect and become more severse
Answer:
d
Explanation:
because to avoid any spread of disease,one need to get it prevented on time
Answer:
False
The left atrium receives oxygenated blood from pulmonary circulation through the left and right pulmonary veins. Blood passively flows into the atria without passing through valves.