Biology study help - Biology study help 23.1 23.2...

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Biology study help 23.1 , 23.2 Transitional forms overview Law of sucession- extinct species in the same regions seem to have similar traits to those of living species which eventually showed that species may had have the same characteristics but have evolved through time Ex land mammals to aquatic mammals Including feathures of flights , to stomata Environmental change - scientist saw that since they are changes in the earth , such as plate tactonics, then there are changes in organisms as well - vestigial traits- which are traits that are incompletely developed structure or no functions , but are cleary similar to functioning organisms ex: human hairs to monkeys hair, monkeys use their hair to arise when they are cold or excited , humans get goosbumbs which has nothing to do with emotions Evidence that species are Related ( what evidence shows that species are related) - evidance: Darwin sailed on the beagle to the galpugous island were he incounterd birds of simial traits, but all were different from each other, question ….how such similar species , but have distinct features be occupied on the same islanc phylogeny-speices that came from the same ancestor, phylogenitic species – branching gram that describes a relationship among species Evidance that species are related—mocking birds that occupy the same island , instead of being independ, they all made new species , and changed throught time Structural homologies Similarities in structure, all came from the same decent just have changed form through time Development Homologies ( What is developmental homology and give an example) - newly developing embryos have similar traits , two types - morphological – form of particular embryonic tissue ex. Tails in some animals, and tails in humans..we lost the tail as time grew, and those that kept it , belong to the same common ancestor
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