Which statement is true about balancing equations?
a. coefficients can be changed, but not made negative.
b. subscripts cannot be changed.
c. the total number of atoms of each element must be the same on both sides of the equation.
d. all of the above.
e. none of the above.

The picture represents the process that produces most of the energy used by living organisms on earth. which process is represented in the picture? a) the magnetic attraction between two hydrogen nuclei. b) the fusion of hydrogen nuclei to produce a helium nucleus in the core of the sun. c) the fission of hydrogen nuclei to produce a helium nucleus in the core of the sun. d) the chemical reaction between hydrogen nuclei to produce a helium nucleus in earth's atmosphere.