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 ²OTIFIED 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 diferent From ±sh scales – on jaw, these are modi±ed to Form their teeth – on some parts oF skin – no placoid scales • bony ±sh: various types Hickman et al. 2007 Animal Diversity 4 th edi>on.
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Smallest known fsh 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 fsh adapta<ons Swim bladder for buoyancy Air sac, adjustable by exchanging gas with blood Fish can stop moving and not sink (saves energy) Bony ±sh probably evolved in fresh water Swim bladder may have been a primi>ve lung for use in shallow water habitats
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This note was uploaded on 12/22/2009 for the course BIO 201 taught by Professor True during the Fall '08 term at SUNY Stony Brook.

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

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