Term
| Exaptation (Definition and Examples) |
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Definition
-referring to shifts in the function of a trait during evolution
-Ex. Bird Feathers - Originally evolved for temperature regulation, later evolved for flight
-Ex. Fleshy fins originally an adaption for swimming and later an exaptation for walking on land |
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Term
| First terrestrial vertebrates |
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Definition
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Term
| Transition from Water to Land Changes and Reason |
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Definition
1. Respiration: Lungs, internal nostrils, skin
2. Support and Movement
3. Hearing: Origin of tympanic membrane
4. Water retention: more concentrated excretory product (Urea vs. Ammonia)
Reason: 350 mya drying episode, fish driven to migrate from pond to pond in search of water with sufficient oxygen to survive |
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Term
| Reasons for world wide decline in amphibians |
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Definition
-Habitat destruction
-Pollution
-Diseases - especially in fungus
-Invasive species
-Increase in UV radiation - developmental problems |
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Term
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Definition
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Term
| Origin of Tetrapods (4 legs) |
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Definition
| -Legs evolved from fins of lobe-finned fish |
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Term
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Definition
| Transition fossil between fish and tetrapods |
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Definition
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Term
| Three major groups of amphibia & Apomorphies |
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Definition
1. Anura (frogs & toads, without tails)
2. Urodela (Salamanders, having tails)
3. Apoda (Caecilians)
-Smooth skin with glands (mucus and poison) |
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Definition
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