KEY CONCEPT Single-celled organisms existed 3.8 billion years ago.

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Presentation transcript:

KEY CONCEPT Single-celled organisms existed 3.8 billion years ago.

Heterotroph Hypothesis The first cells were probably heterotrophs which ate each other. (think “Pac-Men”) Phototrophic cells came later.

Microbes have changed the physical and chemical composition of Earth. The oldest known fossils are a group of marine cyanobacteria. prokaryotic cells Changed Earth by: added oxygen to atmosphere by photosynthesis deposited minerals as stromatolites

Fossil stromatolites provide evidence of early colonies of life.

Eukaryotic cells may have evolved through endosymbiosis. Endosymbiosis is a relationship in which one organism lives within the body of another. Mitochondria and chloroplasts may have developed through endosymbiosis.

The evolution of sexual reproduction led to increased diversity. Genetic variation is an advantage of sexual reproduction. Sexual reproduction may have led to the evolution of multicellular life.