He discovered a new type of medicine that could treat infections.
He discovered the 1st antibiotic (penicillin).
Function of an enzyme is to lower reaction's activation energy and to increase speed of a reaction, but to make it happen, enzyme and substrate must fit spatially. The shape of an enzyme is essential to make enzyme-substrate complex - if active site of an enzyme doesn't fit to substrate, there won't be a enzyme-catalised reaction.
An autotroph is an organism that can produce its own food.
The answer u r looking for is-Hypothesis. Hope I’ve helped ;)
C
Brown algae
Im pretty sure this is correct