What is vital registration system ? explain its merits and demerits

Felicia has a respiratory infection and has been coughing up a lot of mucus. she knows this means that her respiratory system is working to restore balance by getting rid of the invasive materials from her lungs. how does this happen?

Which one of the following causes people to go through a cycle of losing weight, gaining it back, then lose it again

How do you imagine the heart of a person with prolonged high blood pressure might look different from the heart of someone with normal blood pressure?