Which of the following was demonstrated by the miller-urey experiment?
a. life arose spontaneously from inorganic molecules on early earth.
b. in the presence of an energy source, organic molecules can by synthesized from inorganic precursors
c. it is impossible for life to arise from inorganic molecules.
d. organic molecules can be formed from inorganic precursors, but only in the presence of molecular oxygen.
e. it is impossible to replicate conditions on early earth in a laboratory.