Biology Reference
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Figure 22: Phylogenetic tree with a common ancestor for the evolution of living organisms. Based on Cavalier-Smith
(2002).
the splitting of glutamine synthetase into three separate proteins. Archaebacteria share 19 characters
with eukaryotes that are not found in eubacteria.
Fossil evidences suggest that life on the planet Earth might have had its origins in the Precambrian
eon and during the subsequent span of 542 My the evolution of the present day fl ora and fauna
could be traced through the Palaeozoic, Mesozoic and Coenozoic ages, collectively known as
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