Size matters in biology, but not for your career prospects. The joke plays on the literal interpretation of "micro" (tiny) versus regular biologist. Meanwhile, microbiologists are over here studying organisms that have dominated Earth for billions of years and survived five mass extinctions. But sure, enjoy your height advantage while E. coli quietly develops antibiotic resistance and takes over the world. Bacteria don't need lab coats to flex their evolutionary superiority.
I Wonder What A Macrobiologist Looks Like

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