smallest unit of life
cells
protected from a disease
immune (to)
unable to move
paralyzed
a thick liquid produced inside the nose and other parts of the body
mucus
a slight illness that a lot of people catch, causing a cough, sore throat, and blocked nose
common cold
give someone a disease
infect
an extremely small piece of organic material that causes disease in humans, animals, and plants
virus
very small organisms that are found everywhere and are the cause of many diseases
bacteria
another word for "flu"
influenza
an instrument that makes small objects look larger
microscope