1. H2O, CO, CO2, N2, H2S, HCN gases
2. Microfossils are microscopic fossils of organisms that lived on ancient Earth, usually no more than an outline of an ancient cell
3.
i) primordial soup and gases in question 1 transformed into organic molecules with the help of electrical energy of lightnings
ii) from outer space, carried by meteorites
4. If all organisms were heterotrophic then eventually all the organic matter in the organic soup would be used up and there would be no sources of food for organisms (if all of us are consumers then we ran out of food soon.)
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