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Bio 100 Exam 1 - mastering biology questions 2025 with Answers Elements - ....ANSWER☑️☑️...-__________ are substances that CANNOT be broken down into other substances by chemical reactions Which four elements make up the bulk of living cells? - ....ANSWER☑️☑️...-oxygen, carbon, hydrogen, and nitrogen Atomic number - ....ANSWER☑️☑️...-...is the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table. Atomic Weight - ....ANSWER☑️☑️...-The number of protons plus neutrons in an atom, represented as an average of all naturally occurring forms of the element, is known as... Trace elements - ....ANSWER☑️☑️...-... also called micronutrients, are any chemical element required by living organisms in minuscule amounts, but cells require them to survive. Nitrogen - ....ANSWER☑️☑️...-...is one of the four elements that make up 96.3% of living cells. Calcium - ....ANSWER☑️☑️...-...is one of the seven elements that make up a small fraction, approximately 3.7%, of living cells. FOR STUDY PURPOSES ONLY, ©️2025 ALL RIGHTS RESERVED 1