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16-ch18-animals2 - Amniotes are tetrapods that have a...

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Amniotes are tetrapods that have a terrestrially adapted egg amniotic egg w/ shell & extraembryonic membranes : amnion (fluid cushion), chorion (gas exchange), allantois (waste disposal & gas exchange) Day 1 Day 1 Day 5 Day 5 Day 15 Day 15 Day 19 Day 19 Day 10 Day 10 Day 21 Day 21 heart heart eye eye O 2 & CO 2 diffuse freely across the shell surface
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bird eggs are hardened bird eggs are hardened with calcium carbonate with calcium carbonate amphibian amphibian eggs are eggs are fragile in fragile in more ways more ways than one than one reptile eggs have a leathery shell reptile eggs have a leathery shell to slow dehydration to slow dehydration in some snakes, the in some snakes, the eggs develop internally eggs develop internally only a few mammals lay eggs
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- Chelonians (turtles) - Squamates (lizards; snakes) - Crocodilians - Birds amniotes (including mammals & birds)... - use rib cage to ventilate lungs - internal fertilization living reptiles (except birds)... - ectothermic (amphibians & fish) - three-chambered heart (amphibians = 3, fish = 2) - epidermal scales (keratin) Survivors & descendants from the age of reptiles http://biology.uta.edu/herpetology/ A 101 lb komodo dragon ate a 90 lb pig in 20 minutes. (Honolulu Zoo) http://www.youtube.com/watch?v=VD_9mRu9EhY
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“Bobby, jiggle Grandpa’s rat so it looks alive, please.” gape-limited predation
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behavioral thermoregulation bipedal locomotion evolutionary arms race That was smart.
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Archaeopteryx were most dinosaurs endothermic?
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