D. Viral disease
Because it’s a virus that spreads around to other people and need a vaccine to combat it
Answer:
Showing respect
Explanation:
Being first at everything is immature, playing on a cell phone is being off task, and using a fire blanket to keep warm in class shows that you are doing nothing to contribute to the lab.
The amount of salt added to water does not affect the boiling point ot would stay at 100 degrees c or 212 degrees F