VIEWS: 3 PAGES: 6 POSTED ON: 3/23/2012
Fossil Evidence for Evolution What is a fossil? A fossil is a physical remain of an ancient organism. The study of fossils is called paleontology. Fossils of a fish and a wasp. How are fossils made? The organism dies and is Many times there are too covered by mud, dirt or many bacteria and the rock. organism decays before The body starts to decay, fossilization can occur. caused by bacteria Because of this, the fossil metabolizing the organic record is far from complete. material. If few bacteria are present, mineral replacement occurs and eventually the organism becomes rock. Soft Tissue Fossils Soft tissue can sometimes make a fossil record if it leaves an impression in mud that hardens and is preserved Soft tissue fossils can also happen in ice or amber, where the actual organism was preserved For example, insects in amber or wooly mammoth in Arctic ice Extinction Extinction is when the last living member of a species dies out Extinctions have been happening at a much faster rate This is due to the increase in human population- hunters, decrease of habitat ie; passenger pigeon A passenger pigeon. How do fossils provide evidence for Evolution? Fossils provide physical Fossils also are evidence of records of organisms that the rate of evolutionary are not alive today. change. These are very helpful for Fossils in intermediate scientists to study body stages between species structures of ancient and their ancestors give organisms and relate them clear evidence of evolution. to modern species. Fossils of feathered dinosaurs found in China reveal some evolutionary stages between dinosaurs and birds.
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