D. discovered chemolithotrophs in natural environments.
Explanation:
<em>Sergei Winogradsky is a Microbiologist, an Ecologist and a soil scientist from Russia who discovered chemolithotrophy mode of nutrition while studying a particular genus of bacteria.</em>
<em>He found that the bacteria genus had the ability to oxidize hydrogen sulfide with deposition of sulfur.</em>
There are so many examples for that in different areas, like TPT1 experiment carried out in our lab recently.Here's one link: http://www.alfa-chemistry.com/tpt1-cas-167218-46-4-item-290583.htm
