Calculate: The density of an object is equal to its mass divided by its volume: D = m ÷ V. The density of solids is measured in grams per cubic centimeter (g/cm3). What is the density of object A? pls help I have a gizmo test

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.