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Years Ago
The earliest forms of living organisms, single celled bacteria, were in existence.
Micro-organisms capable of photosynthesis were in existence.
Multicellular organisms came into being.
The colonization of land by plants and animals began.
The most severe of the mass extinctions in the history of life (more than 90 percent of all species wiped out).
The emergence of the first flowering plants.
A mass extinction bringing an end to many forms of life; including all the dinosaurs and flying reptiles.
Great diversification among birds, mammals and flowering plants.
Homo erectus in existence.
Homo sapiens in existence.