BIOS10112 Study Guide - Midterm Guide: Tube Feet, Hydrophiinae, Spinal Cord

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3 Oct 2016
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Cambrian explosion 0. 5 billion years ago: lasted 40 million years number of species continues to grow, most important source of marine evolution. Melting permafrost, warming from volcanoes, and ocean acidification lead to mass extinction (always occurring) Convergent characteristics: different organisms have similar characteristics but are not actually related these traits evolved independently. 3 reasons species might share a trait: share a primate, shared derived (groups organisms into clades either a common trait in two lineages or one evolved from single lineage, convergence. Outgroup = an organism that is distantly related to the group you are studying. Parsimony = least number of changes (which has the simplest explanation?) Ecosystem: space where a combination of species live. Population: interbred group of organisms in one species that live together in one area. Community: describes how a population interacts living, competing, etc. Habitat: environment where an organism lives (physical and biological; ex some need a hard rock to cling to)