bacteria :  Microscopic, single-celled organisms that exist around you and inside  you.
conclusion:  The summary of an experiment, based on data related to a hypothesis.
culture:  To grow micoroorganisms in a specially prepared nutrient medium.
decomposer:  An organism, often a bacterium or fungus, that feeds on and breaks down dead plant or animal matter.
experiment:  A series of steps to find the answer to a question.
fungi:  Organisms that are neither plant or animals, but have characteristics of both and absorb food from whatever they are growing on.
hypothesis:  An idea made into a statement that can be tested.
investigation:  A process designed to answer a question.
microorganism:  A living thing that can only be seen with the aid of magnification.
organism:  A living thing.
producer:  A living thing, like a green plant, that makes its food from simple substance usually using sunlight.
protozoan:  Microscopic organisms that usually live in water.
single-celled:  any organism that has only one cell, the smallest unit of life.
variable:  (experimental)  A part of an experiment that is changed in order to find out the effects of that change.
control:  A part of an experiment that is kept the same to be used for comparison.