Which of the following is an example that includes evidence of a chemical reaction? a. A sample of zinc is placed in water and it settles to the bottom
b. A solid block of ice is heated and it completely melts into a liquid.
c. Sugar that is burned gives off an odor and turns brown and then black.
d. A tomato is chopped up into smaller pieces.

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.