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What is an element?
What is mass?
What is matter?
What is a particle?
Water is made of 1 oxygen molecule and _____ hydrogen atoms.
Which element is not radioactive?
What element do all organic compounds contain?
One of the essential minerals in the human body is salt. How much salt (NaCl) is in the average adult human body?
DNA codes for proteins, which are the building blocks of organisms. What is the most abundant protein in the human body?
You can’t live without iron. Where in the body is most of the iron located?
The practice of yoga triggers the release of the brain chemical gamma-aminobutyric acid, or GABA, a chemical in the brain that helps to regulate nerve activity.