BIOL 1070 Lecture Notes - Lecture 3: Speciation
5 Dec 2012
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Divided into three major parts: visera, muscular foot and mantle. Molluscs all have a mantle: the phylum all have similar parts but the different classes have more disparity. Mantle: folding of the body wall that lines shell; secretes shell substance (shell made up of calcium carbonate) Mantle cavity: houses gills- important for respiration and digestion. Adaptation is the evolutionary change over thousands of generations, enhances survival and reproduction through natural selection. Co-option of a functional tissue into a new additional function. Not all simple lures go into a complex lure. If one of the host species for a mussel became extinct, On average, species persist for about 4 million years (or about. Failure to adapt to a changing physical environment or to find new suitable habitat (no gene flow) Failure to keep up with the evolution of a competitor, predator, host, pathogen etc. Being driven to extinction by a newly encountered competitor, pathogen, or predator.
