Each element on the periodic table is defined by __________________, which is also known as the atomic number.

A. the number of protons
B. the number of neutrons
C. the number of electrons
D. the total number of protons and neutrons
E. the mass number


Ans: A. the number of protons

Biology & Microbiology

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Indicate whether this statement is true or false.

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What structure prevents water from moving between cells of the endodermis of the plant root?

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