addition
Sum is the result of an addition problem.
Difference is the result of a subtraction problem.
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Answer is choose a drawing then, put a desired math symbols (addition, subtraction, multiplication and division smbols) to its linings and voila! you have a pretty good African art...... @)--}--
Subtractive. He chiseled marble rocks.
Protons.The atomic number of an atom is the number of protons in the atom. The identity of an atom is based on its atomic number, so a change in the number of protons mean an atom has turned into a different element. However, an addition or subtraction of neutrons creates different isotopes of an element, and a change in the number of electrons creates an ion of the element.
I think therefore I am
biodiversity