What is an atomic mass of an atom referring to?

what is an atomic mass of an atom referring to?Lr. The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit (amu, also known as daltons, D). The atomic mass is a weighted average of all of the isotopes of that element, in which the mass of each isotope is multiplied by the abundance of that particular isotope.

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Other organisms can change their behavior to take the place of the plants in the ecosystem.