Evolutionary events

This system for keeping track of these important units is used as the basis for the standard geologic lime and the evolution of the animal life on earth. (See also Tables 2-26 and 2-27.) Table 2-28 gives the relationship between geologic time and important physical and evolutionary events that are used to aid in the identification of rock units in relative geologic time [26]. 

As already mentioned, the HGT principle has been known for many years however, until about 15 years ago, it was regarded as only a weak force in the evolutionary events involved in the development of primeval cells, whose organisation must have been very simple. They probably had a loose structure which could easily be modified by HGT processes. An important characteristic of Woese s model is the nature of the evolutionary process Woese assumes that cell design could be achieved only by the overall performance of HGT. It was the community as a whole,... 

Table 1.1 Atimefine of evolution demonstrates the tremendous expanse of geologic time compared to the period since humans evolved. The indicated times of evolutionary events are subject to change as new information is found. ...

There it is, the story of the main events in evolution, shrouded in nebula as is the black hole at the center of our galaxy. We can know it is there by the way it pulls in stars and gases as it bends space into a whirlpool of gravity, and we know that the evolutionary events were there by the way they spew finished creatures from an invisible past without much warning and with their origin hidden from our view. 

The development of the types of skeletons that characterize Tommotian faunas constituted a major evolutionary event. Although skeletons are known to support soft tissue and to facilitate locomotion, such adaptive functions cannot explain why so many different kinds of skeletons developed suddenly in the early part of Tommotian time. It has been suggested that a chemical change within the oceans triggered the production of these skeletons, but this hypothesis does not explain why some skeletons were composed of calcium carbonate and others of calcium phosphate, two compounds with quite different chemical properties. The rapid evolution of various kinds of external skeletons is probably in part attributable to the fact that animals... 

A clonal model places all the discriminating action at the very bottom of the evolutionary events and that proposal, in turn, leads to the uniformity argument. Major development occurs early on when the chemical system is at maximum plasticity, and that is not only the source of basic uniformity but also the major source of emotional resistance to the new model within the scientific community. The proposal that chemistry worldwide would either give rise to the same mode of life or to no life at all seems an assault on common sense, the same common sense that has been so successfully assaulted by all the pioneers in science early in the past century. 

The Genomic Potential Hypothesis develops the evolutionary events as a consequence of chemical/biochemical principles. Even complex biochemical processes such as thought and emotion fall under the purview of science and perusal of contemporary science literature supports that statement. 

The ETP for the same GA calculation on the a phase of L-glutamic acid is shown in Fig. 19. The ETP traces the ancestry of the correct structure solution (or any selected structure in the final population), to provide a graphical representation of the sequence of evolutionary events that led to the production of this structure. This representation is analogous in some respects to a family tree in genealogical contexts. The nodes in the ETP represent the structures in a given population which participate in events that lead subsequently to the production of the correct structure solution. A line between nodes indicates that the structures (in adjacent generations) are connected by an evolutionary event, and the colour of the line indicates the nature of this evolutionary event. Importantly,... 

Molecular Clock Places timescales on evolutionary events. See Zuckerkandl, E., On the molecular evolutionary clock, J. Mol. Evol. 26, 34-46, 1987 Easteal, S., A... 

Table 3 Schematic showing time in billions of years before present, major eras and associated biospheric and geospheric evolutionary events, and hypothesized atmospheric composition. Gases are listed in order of their hypothesized concentrations and those whose sources and/or sinks are dominated by biological processes are denoted with an asterisk. Note the transition from an abiotic to an essentially biologically controlled atmosphere over...

---