Evolution Process

A species is able to lodge when it has sufficient genetic variance to fox what amount to a lot of "choices" so that some adaptations will be roaring and will be passed on to subsequent generations. Darwin explained the idea of distinction by examining the facts as observed and developing theories to explain those facts. He observes domestic animals and the development of a breed over measure and determines that the way human beings have used domestic animals has modify some roles of those animals and diminished the use of others, producing modifications that were then transmitted by subsequent generations. He then extrapolates from this to nature in general, everlastingly acknowledging limitations in his method:

Under free nature, we sess have no standard of comparison, by which to judge of the make of long-continued use or disregard, for we know not the p bent-forms; but some(prenominal) animals have structures which can be explained by the effects of disuse (Darwin, 1964, 134).

Darwin's method is to examine changes based on relationships between cardinal generation and the next or one species and related species. He is explaining inconsistencys which can be observed, showing that the way a difference develops is based on the way the species responds to its environment:

When a variance has been developed in an extraordinary manner in all one species, compared with the other species of the same genus, we may conclude that this part has undergone an extraordinary amount of modification,

Losos, J.B., Jackman, T.R., Larson, A., de Queiroz, K., & Rodriguez-Schettino, L. (1998, work 27). "Contingency and determinism in replicated adaptive shaft of lights of island lizards." Science, 2115-2118.

Ehrlich, P.R., Holm, R.W., & Parnell, D.R. (1974). The process of ontogeny. New York: McGraw-Hill.

Species radiation has been observed in diametric species in different environments on earth, and attempts have been made to replicate radiation to show what forces are at work in the process. A recent newspaper publisher on the adaptive radiations of island lizards in the Greater Antilles suggests that adaptive radiation may have similar results in similar environments.

This is parry to the theory of historical contingency, which proposes that unique events in the past have a large influence on subsequent developing and that repeated occurrences of an evolutionary event would result in radically different outcomes. One motive for this belief is that faunas and floras that have evolved in similar environment often show more differences than similarities. The reason for this is that certain factors which cause taxa to respond to similar selective factors in different ways combine with unique historical events and crafty environmental differences. However, research with the island lizards shows that such factors do not always lead to disparate outcomes. A comparison of events on different islands showed the repeated evolution of the same ecomorph types. It was noted that the recurring evolution of ecologically and morphologically similar species suggested that adaptation rather than constraint is the reason for the predictable evolutionary responses shown in this experiment (Losos, Jackman, Larson, de Queiroz, and Rodriguez-Schettino, 1998, 2115-2117).

Ehrlich, Holm, and Parnell (1974) boot the development of birds as a case of adaptive radiation in the early stages as they split from the archosaurian reptiles of the Mesozoic and apparently perfected flight th
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