Which is the best way to keep your muscular system healthy?

What are 3 social benifits, 3 emotional benifits and 3 physical benefits to abstinence?

Which term defines one's age as measured by how well the body is working? chronological age biological age social age mental age

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?