molecule that help fight disease and infection.
(singular: bacterium) single-celled organisms found in every ecosystem on Earth.
conditions that surround and influence an organism or community.
(singular: fungus) organisms that survive by decomposing and absorbing nutrients in organic material such as soil or dead organisms.
amount of water vapor in the air.
statement or suggestion that explains certain questions about certain facts. A hypothesis is tested to determine if it is accurate.
network of chemicals and organs that protects the body from disease.
tiny organism, usually a bacterium.
image or impression of an object used to represent the object or system.
smallest physical unit of a substance, consisting of two or more atoms linked together.
slimy, fluid secretion of some animals.
copy or reenactment.
substance used for washing and cleaning.
sign or indication of something.
degree of hotness or coldness measured by a thermometer with a numerical scale.
pathogenic agent that lives and multiplies in a living cell.