7 BIOL 1001 Evidence for Evolution (Jan. 21) post-lect

Taxonomic bias what parts fossil embryos 68 evidence

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Unformatted text preview: A bone, tooth, shell, or other hard part of an organism that has been preserved. C.  Any trace of an organism that lived in the past. D.  The process that leads to preserva-on of any body part from an organism that lived in the past. 61 Evidence for Evolu-on – The Fossil Record 62 Evidence for Evolu-on – The Fossil Record If no decomposi-on before/aIer burial, can s-ll get fossil. 64 Evidence for Evolu-on – The Fossil Record Even if remains get decomposed aIer burial, can s-ll get fossil! 65 All organisms have an equal chance of fossiliza-on. A.  True B.  False Evidence for Evolu-on – The Fossil Record Limita-ons of the fossil record • Habitat bias •  Need the right condi-ons at the right -me for fossiliza-on 67 Evidence for Evolu-on – The Fossil Record Limita-ons of the fossil record • What types of organisms are most likely to fossilize? • Taxonomic bias What parts? > Fossil embryos! 68 Evidence for Evolu-on – The Fossil Record Limita-ons of the fossil record – increase likelihood of fossil being found… • Temporal bias • Abundance bias 69 Evidence for Evolu-on – The Fossil Record Limita-ons of the fossil record • Habitat bias • Taxonomic bias • Temporal bias • Abundance bias 71 The Fossil Record – The Fossil Record What affects the likelihood that a fossil will be found? Where the fossil is must be accessible (e.g., road cuts, eroded areas can get to. Paleontologists es-mate the dates of fossils by A.  The layer of rock within which the fossils are found. B.  Analysis of radioac-ve isotopes found in nearby rock C.  The complexity of the body plan of the organism D.  All of A- C are cor...
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