Which statement best compares the moon and earth?

they both spin at the same speed.
the moon has carbon dioxide, but earth has oxygen and nitrogen.
they both take the same time to complete one revolution around the sun.
the moon has no atmosphere, but earth has an atmosphere rich in liquid water.

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.