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Which of these best describes an ionic bond?

The difference between the atomic number of an element and the element’s atomic mass is the number of ions.

Skills of homo sapiens were found an excavation. the skulls were preserved because the bodies were frozen. so, these fossils are (blank) fossils.the image shows the evolution of skulls beginning 2 to 3 million years ago. based on the image, modern human skulls(blank) ape skulls.