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Bio 201 F09 True lect 17 (L18)v2r

Bio 201 F09 True lect 17 (L18)v2r - todaysfactoid...

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today’s factoid ‘Snake Slithering’ story in Biology in the News on BB recent research on snake movement has found that scales on the bellies of snakes provide fric>on against the ground necessary for movement sliding sideways is more work than sliding forward also, snakes distribute their weight as they move, concentra>ng weight where it is needed for trac>on http://www.radgraphics.net/images/main/Bullsnake2.jpg http://www.bbc.co.uk/gloucestershire/content/images/2007/06/04/ snakescalegal_400x300.jpg
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2 st mid term exam Wed. Oct. 21st in class On material from 9/25 – 10/16 prac>ce ques>ons will be posted soon review session >mes will be announced in class Friday and on BB Be on >me – >10 min late will not be allowed into room Bring only your ID and pencils – All other materials have to be leN on periphery of the room 35 mul>ple choice ques>ons + 3 bonus factoid ques>ons lowest of the three mid terms is dropped, avg. of other 2 = 60% of your grade Only documented medical/family excuses accepted; we need to be NOTIFIED before end of the day on the day of the exam
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some addi>onal details about scales • sharks: placoid scales – very different from fish scales – on jaw, these are modified to form their teeth – on some parts of skin – no placoid scales • bony fish: various types Hickman et al. 2007 Animal Diversity 4 th edi>on.
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Smallest known fish Paedocypris progene/ca • Adults 7.9 mm (.31 in) • Head has lost skull bones • Discovered in 2006 in acidic peat swamp in Indonesia – Dark, tea‐colored water, ph ~3 – Threatened by human deforesta>on ac>vi>es • Member of the carp family (Cyprinidae)
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Bony fish adapta<ons Swim bladder for buoyancy Air sac, adjustable by exchanging gas with blood Fish can stop moving and not sink (saves energy) Bony fish probably evolved in fresh water Swim bladder may have been a primi>ve lung for use in shallow water habitats Fins of ray‐finned fishes
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