Look at the chemical reaction C2H6 + 137 kJ → C2H4 + H2. How does the chemical energy of C2H6 compare to the chemical energy of C2H4 and H2?

Particle model to predict what will happen if a sharp object creates a hole in the soccer ball

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.

When did stem cell research become known ? who discovered stem cell? what experiments or studies have been conducted so far?