The Digestive and Excretory Systems essay plsss help

Take a nutritional supplement during times of stress a. is recommended by al doctors as a stress management technique b. has been scientifically proven to aid in stress management c. only adds to the stress you’re feeling d. can you feel better because you believe it will you

Aspeed limit sign that says "night" indicates the legal speed between sunset and sunrise. a. minimum b. maximum c. only d. average

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?