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Homology is evidence of common ancestry. Homology is the divergence of a structure in a commom ancestor in its descendants. The classic example of homology is the vertebrate forelimb. The forelimb (arm) of a human has the same bones and underlying structure as that of most other mammals such as the whale, cat, dog, horse, cow, mouse, bat, and deer (etc.). Also homology provides a large amount of evidence that supports evolution.

2006-11-23 16:19:24 · answer #1 · answered by mg 3 · 2 0

Common ancestry.

In biology, two or more structures are said to be homologous if they are alike because of shared ancestry. This could be evolutionary ancestry, meaning that the structures evolved from some structure in a common ancestor (the wings of bats and the arms of humans are homologous in this sense), or developmental ancestry, meaning that the structures arose from the same tissue in embryonal development (the ovaries of female humans and the testicles of male humans are homologous in this sense).

2006-11-23 16:20:32 · answer #2 · answered by bepatrice 2 · 2 0

because of the fact the person-friendly ancestor of mammals and dinosaurs/birds is unavailable for examination, any answer might could be based often on a stability of percentages There are conceivably many techniques of setting up a double circulatory device and the fact that the two communities have often analogous vessels with the equivalent heart chambers and vessels serving an analogous purposes might factor in direction of person-friendly ancestry. The case for Homeothermy is way less clean - and it would look that some dinosaurs exhibited it on an analogous time as others did no longer. yet whether or no longer they inherited from someone-friendly ancestor shared with mammals and then some consequently misplaced it or progressed it independently is complicated to illustrate. returned i might use the theory of analogy to argue for person-friendly ancestry. The metabolic pathways and enzymes utilized in warmth technology (particularly the de-coupling of metabolic pathways from potential production and storage and into warmth production) are sufficiently comparable in the two communities to argue for person-friendly ancestry. There are greater techniques of producing physique warmth and for the two communities independently to conform an analogous mechanism seems unbelievable

2016-12-13 13:18:17 · answer #3 · answered by ? 3 · 0 0

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