Which evolved first autotrophs or heterotrophs

Keywords: amino acid fermentations; archaeal type III RubisCO; autotrophic origins; hydrothermal vents; purine fermentations.

Abstract The theory of autotrophic origins of life posits that the first cells on Earth satisfied their carbon needs from CO2. Publication types Research Support, Non-U.

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After this first engulfment occurred, the big cell may then be invaginated by an even bigger cell, creating the mitochondria, or the powerhouses of cells. Scientists believe this to be the mechanism by which all life originally evolved from unicellularity to become multicellular with specialized organization of tissues.

The move of autotrophs to land, which occurred approximately about million years ago, involved both benefits and risks. This move would not have been possible if not for the free oxygen products emitted from the original aquatic autotrophs, which produced a protective ozone layer O 3 to filter out the dangerous ultraviolet radiation. Plants evolved very specialized organs, such as leaves, to condense the chlorophylls and transport carbohydrates.

Unfiltered sunlight also necessitated the development of mechanisms for filtering sunlight, such as the carotenoid pigments and the tissues for regulating the uptake and release of oxygen and carbon dioxide.