1- Which do you think came first- phototrophy or lithotrophy- Why- Wha.docx

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This document asks 4 questions about microbial life: 1) whether phototrophy or lithotrophy came first and what they have in common, 2) what the presence of microbes that oxidize and reduce nitrogen and sulfur means for their ecosystem role, 3) the evidence for the endosymbiont theory explaining mitochondria in eukaryotes and if it only happened once, 4) what the Candidate Phyla Radiation story reveals about finding microbes in the environment and searching for extraterrestrial life.

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1. Which do you think came first, phototrophy or lithotrophy? Why? What do they have in
common? 2. What do you think the presence of microbes that oxidize nitrogen or sulfur
compounds for energy, along with those that reduce these compounds, means for the role of
microbes in ecosystems? 3. What is the evidence for the endosymbiont theory that explains the
rise of mitochondria in Eukarya? Did it only happen once? 4. What does the story of the
Candidate Phyla Radiation tell you about the search for living microbes in the environment?
What does it imply about the potential search for extraterrestrial life..

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