a fibrous protein that makes up the outer layer of your skin, hair, and nails
responsible for filtering the blood, removing waste products, and regulating blood pressure
a unit of mass that is equal to 1,000 grams
the energy of motion
the second highest taxonomic rank in biology, just below domain
a complex joint that connects the thighbone (femur) to the shinbone (tibia) and the patella (kneecap)
a chemical element with the symbol Kr and atomic number 36
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