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The oldest eukaryote fossils are acritarchs dating to about 1.75 Byr. (1985) "The tempo of change in the evolution of mid- Pleistocene Homo." In Ancestors: the Hard Evidence.
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A very general conclusion made from the theory of common descent is that life, as a whole, was different in the past. (2000) "Retroviruses and primate evolution." Bio Essays 22: 161-171.
The predicted evolutionary pattern is that the farther back we look back in time, the more different life should appear from the modern biosphere. (1998) "Primate evolution—in and out of Africa." Current Biology 8: R582-588.
Bacteria have acquired resistance to viruses (Luria and Delbruck 1943) and to antibiotics (Lederberg and Lederberg 1952). coli, we have seen the evolution (by artificial selection) of an entirely novel metabolic system including the ability to metabolize a new carbon source, the regulation of this ability by new regulatory genes, and the evolution of the ability to transport this new carbon source across the cell membrane (Hall 1982).
Bacteria have also evolved the ability to synthesize new amino acids and DNA bases (Futuyma 1998, p. Unicellular organisms have evolved the ability to use nylon and pentachlorophenol (which are both unnatural manmade chemicals) as their sole carbon sources (Okada et al. The acquisition of this latter ability entailed the evolution of an entirely novel multienzyme metabolic pathway (Lee et al. Bacteria have evolved to grow at previously unviable temperatures (Bennett et al. Such evolutionary acquisition of new function is also common in metazoans.
As we have seen, the standard phylogenetic tree predicts many common ancestors and their morphologies. By extrapolation, the majority of past organisms also have gone extinct.
However, given what we know of modern species dynamics and recent extinction rates, we know that the majority of organisms will eventually go extinct (Diamond 1984a; Diamond 1984b; Wilson 1992, ch. Thus, we should reasonably expect that the predicted common ancestors had many other descendants and relatives that did not leave descendants which survive today.
We have seen genomes irreversibly and heritably altered by numerous phenomena, including gene flow, random genetic drift, natural selection, and mutation.
Observed mutations have occurred by mobile introns, gene duplications, recombination, transpositions, retroviral insertions (horizontal gene transfer), base substitutions, base deletions, base insertions, and chromosomal rearrangements.
Cladistic classification, and thus, phylogenetic reconstruction, is largely based on the various distinguishing morphological characteristics of species.
Macroevolution requires that organisms' morphologies have changed throughout evolutionary history; thus, we should observe morphological change and variation in modern populations.
Thus, the oldest fossil prokaryotes date to 3.4 to 3.5 Byr.Tags: Adult Dating, affair dating, sex dating