Evolution. Diversity of Life. Lamarck s idea is called the. If a body

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1 Evlutin Diversity f Life Lamarck s Thery f Evlutin Lamarck s idea is called the. If a bdy part were used, it gt strnger. If bdy part NOT used, it deterirated Lamarck is credited with helping put evlutin n the map and with acknwledging that the in shaping the species that live in it. Lamarck said that evlutin was a f becming mre cmplex and perfect. Even thugh this belief eventually gave way t Darwin's thery f natural selectin, Darwin. Darwin cncluded evlutin was based n, rather than striving twards a gal (perfectin). Malthus Observatins n Ppulatin Grwth Thmas Malthus bserved by resurces such as the fd supply. Malthus reasned that if the human ppulatin cntinued t grw unchecked, sner r later there wuld be insufficient living space & fd fr everyne. will increase t. Darwin realized Malthus s principles were visible in nature. Plants & animals prduce far. Mst ffspring die; therwise the Earth wuld be. Charles Darwin the Naturalist The Galapags Islands are a grup f 16 Islands 1000 km west f ; part f. The sailed frm England n December 27 th, 1831 and returned n Octber 2 nd, 1836.

2 The Beagle sailed acrss the Atlantic Ocean t d detailed hydrgraphic surveys arund the suthern casts f. The Captain, Rbert, invited Charles Darwin because he wanted a naturalist t accmpany him. The Galapags Islands Finches n the islands resembled a. Mre types f finches appeared n the islands where the (seeds, nuts, berries, insects ). Finches had different types f beaks t their type f fd gathering. Darwin s Observatins were seen. Darwin bserved adaptatins in rganisms. He determined that species. Darwin cllected fssils f bth living rganisms & rganisms. Fssils included: Giant grund slth f Suth America Darwin bserved that if left unchecked, the number f rganisms f each species will, generatin t generatin. In nature, ppulatins tend t in size because envirnmental resurces are. Prductin f mre individuals than can be supprted by the envirnment leads t a. Only a fractin f ffspring survive each generatin. This can be referred t as. Individuals wh are likely t leave than less fit individuals. Darwin s Evlutinal Thery f Natural Selectin What is natural selectin?

3 Acts n a range f in a. NOT n Individuals!!!!!!!!! Evlutin S what is Evlutin?. Creating new. What can cause genetic changes? Envirnmental changes Chemicals Sme examples are: Reprductive islatin Gradualism- Adaptatins Adaptatins are. Adaptatins can be:, such as speed, camuflage,, quills, etc.

4 OR, such as slitary,, packs, activity, etc. Natural Selectin is: When certain variatins survive, reprduce and pass their t the next. It takes several generatins t develp. Natural Selectin Adaptatins are a luck f the draw -. Chances are slim. Any individual CANNOT change ; it can hwever pass changes ( ) nt its ffspring. Natural selectin des nt give rganisms what they need; it is a that. The driving mechanism behind the prcess f natural selectin is. Natural selectin (the physical quality f an rganism)- which as a result causes a change in the genes determine the phentypes. Natural Variatin and Artificial Selectin Natural Variatin - differences amng individuals f a species Artificial Selectin - selective breeding t. The Origin f Species Darwin s was published n Nvember 24 th,.(full title: On the Origin f Species by Means f Natural Selectin, r the Preservatin f Favred Races in the Struggle fr Life.)

5 Darwin initially nly shared his research with a select few. Darwin published because urged him t after published an article with ideas similar t Darwin s. Mendel s studies - the missing link. In Darwin s time, there was n mechanism t explain natural selectin. Hw culd t later generatins? With the rediscvery f in the first half f the 20th century, the missing link in evlutinary thery was fund Evidence fr Evlutin 1. Embrynic Develpment- similarities in early develpment Embrynic structures f different species shw significant similarities during develpment early stages f vertebrate develpment 2. Micrevlutin- 3. Bdy Structures Hmlgus Bdy Structures - structures that are inherited frm a. Structures have, but develp frm the. Prvides strng evidence that all fur-limbed animals with backbnes descended, with mdificatin, frm a cmmn ancestr. Scientists nticed animals with backbnes (vertebrates) had similar, but may differ in frm r functin.. (Arms, wings, legs, flippers) Vestigial Structures - structures that are. i. Examples: legs n skinks, pelvic bne f whales

6 4. Bilgical Mlecules Similarities in. The mre alike tw rganisms are, the mre they have in cmmn (genetic sequence). Examples - Chimpanzees and humans share a nearly identical amin acid sequence. 5. The Fssil Recrd FOSSIL RECORD: all infrmatin abut past life that can prvide evidence abut the n Earth. The fssil recrd is, because nt all rganisms becme fssilized after death. Over f all species that have ever lived n Earth have becme.