A certain element (X) has isotopes with mass numbers of 10 and 11. The X-10 isotope has an atomic mass of 10.013, and it represents 19.9% of all atoms of this element. The X-11 isotope has an atomic mass of 11.009, and it represents 80.1% of all atoms of this element. Therefore, the average atomic mass, or atomic weight, of this element is amu.

in situ hybridization has been widely used for research applications, including clinical cytogenetics, gene mapping, tumor biology and studies of chromosome evolution.

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the supermassive black hole is in the middle of the galaxy.

b.have there own function.