Ch 23 review notes

Ch 23 review notes - CHAPTER 22 Evolution by Natural...

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CHAPTER 22: Evolution by Natural Selection Scientific theories have two components: a pattern & a process Charles Darwin Descent with Modification - the species existing today have  descended from other, preexisting species and that species are  modified or change through time.  Terms Fossil - any trace ofa n organism that lived in the past.  Fossil record - all the fossils that have been found Sedimentary rocks-  form from sand or mud deposited at locations  such as beaches or river mouths and are very prone to fossils.  Geologic time scale - different periods of geologic time Transitional form - a  fossil species with traits that are intermediate  between those of older and younger species.  2 observations about living species… 1. Darwin was the first to describe  vestigial traits  (reduced or  incompletely developed structures that have no function or reduced  function but are clearly similar to functioning organs/structures in  other species). Ex: Boas have hip bones, humans have tailbones… 2. Populations have changed in response to changes in their  environment Phylogeny - a family tree of populations or species Resemblances among species are structural, developmental, and  genetic in nature.  1.
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