Final answer:
Microorganisms provide commercial benefits through the production of antibiotics and human insulin, utilizing fungi and recombinant DNA technology respectively.
Step-by-step explanation:
The common commercial benefits of microorganisms include the synthesis of antibiotics and insulin. Antibiotics, which are biotechnological products, are produced by microorganisms such as fungi to counter bacterial populations. These microorganisms are cultivated on a large scale in fermentation tanks to produce antibiotics. On the other hand, biotechnological advancements, specifically recombinant DNA technology, have facilitated the production of human insulin in bacterial cells like E. coli. This technology was a significant breakthrough, especially compared to previous insulin treatments derived from pigs, which often triggered allergic reactions in humans.