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A ____ is a weakened or non-functioning virus that is used to stimulate the immune system into making antibodies.
aid in digestion, act as decomposers, clean oil spills, treat sewage
Ways in which bacteria help humans
___ is the process by which bacteria use energy of chemicals such as hydrogen sulfide, to make food.
Bacterium can form an ____ when conditions are adverse. During this time the bacteria is dormant or in a resting stage.
The process of heating food to high temperatures to kill off bacteria is called _____.
prevent food spoilage
Pasteurization, refrigeration, freezing, canning, salting, smoking and cooking food are all ways to _________ by bacteria.
When conditions are right ___will occur, which is the beginning of growth of a new plant from a spore or seed.
___ occurs when a pollen grain reaches the part of the plant containing the female egg and releases the sperm.
Once the eggs are fertilized and the seeds form, the ovary wall will thicken and the ovary becomes the ____.
The ___ packages the xylem and the phloem together, it's the "highway" of the plant.
The layer that helps protect the leaf and is where gas exchange occurs because it has the tiny openings.
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