A student rolls a ball at different speeds to try moving a box of sand.

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.

Ahypothesis must be testable and falsifiable to be considered scientific a. trueb. false

Is a chemical message sent by another individual.