Include the same bones, in the same relative Porpoise, and the wings of the bat, should all beĬonstructed on the same pattern, and should What can be more curious than that the hand ofĪ man, formed for grasping, that of a mole forĭigging, the leg of a horse, the paddle of the.That scientist discovered phylogeny, meaning theĮvolutionary history of a group of organisms. It was through comparing the anatomy of organisms.As Organisms are oftenĬlassed together according to similarities in Organisms often provides evidence to support the

Comparisons of anatomical features in different.Comparative Anatomy includes Homologous andĪnalogous structures as well as vestigial.This allowsįor placement of fossils to be used as an aid in The oldest fossils appear in lower layers, and.Particular time frame and shows an organism which This stratigraphic column shows the order in.May now be extremely different in appearance. Trace animals alive today to early ancestors that In some cases fossil evidence allows scientist to.Organisms show large or small differences with It has been found that fossils of similar.Once the fossil has been dated it can be used asĪn index with other fossils from the same periodĮvolutionary evens at different locations byĬomparing the fossils that are in the time.Scientists can tell how old a fossil is by carbon.Fossils are also formed through freezing, beingĮmbedded in amber, preserved in tar, or even.Species that lived in that location over time. Layers we can understand the progression of the By observing the appearance,Ībundance and types of fossils in each of these As time progresses various sedimentary layers getĭeposited, with the oldest on the bottom and the.Hard tissues is replaced by minerals as the

Over time the calcium in their bones and other.

In sediments, causing little decomposition of the

Fossils are formed when organisms become buried.

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