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AUTOtrophs collect these building blocks from non-organic materials such as rock, air, water, etc.
As an example, plants make sugar out of carbon dioxide, which is a non-organic form of carbon. HETEROtrophs obtain their carbon from previously-made organic compounds, like sugars and proteins and fats.
Each of these words is made up of three separate words: photo/chemo, auto/hetero, trophic.
For bacteria, we often classify their metabolism based on how they obtain the two things all organisms need to live: energy and chemical building blocks.
(including marcescens, the "red" colored bacterium..other 13 described species are non-pigmented) are neither photoautotrophic or chemoautotrophic. An organism has a "trophic position" in a food chain...predator and prey are both trophic relationships.
Trophic refers to the manner in which an organism acquires material from the environment to grow and reproduce.