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Science Final Crossword

Teacher: Mrs. Decker
Across
A upper chamber of the heart that receives blood.
A substance that cause an allergy.
A way of learning about the natural world though observations and logical reasoning.
The reaction of a person's body to potentially threatening, challenging, or disturbing events.
The voice box.
A poison that can harm an organism.
The amount of space that matter occupies.
An instrument that makes small objects look larger.
A group of related parts that work together to perform a function or produce a result.
The process by which waste is removed from the body.
An organism that benefits by living with, on, or in a host.
Down
A disease caused by a virus that attacks the immune system.
The different forms of a gene.
A measure of how much matter is in an object.
Material, energy, or information that goes into a system.
The basic unit of life.
The difference between the greatest value and the least value in a set of data.
An attitude of doubt.
A bundle of nerve fibers.
A chemical that comes from the break down of proteins.
An opening though which sweat reaches the surface of the skin.
The junction where one neuron can transfer an impulse to the next structure.
The middle number in a set of data.
Strong connective that attaches muscle to bone.