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25 Cards in this Set
- Front
- Back
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what is a chordate?
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an animal that has a dorsal, hollow nerve cord; notochord, pharyngeal pouches, and tail
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what is a notochord?
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long supporting rod that runs through body
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what is a pharyngeal pouch?
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paired structure in throat
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what % of chordates are vertebrates?
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96%
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what are the two groups of nonvertebrate chordates?
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tunicates and lancelets
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describe tunicates:
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filter feeders
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what are lancelets:
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fish-like things that live on sandy ocean bottoms
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what defines a fish?
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aquatic vertebrate, paired fins, scales, and gills
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what was the age of fishes?
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odovician and silurian periods
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how do they breathe?
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now is this question really necessary?
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what kind of circulatory system do fishes have?
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single-loop closed
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how do fish excrete waste?
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in the form of ammonia
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what is a swim bladder?
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a gas filled organ that adjusts buoyancy
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what is oviparous?
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eggs hatch outside mom's body
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what is viviparous?
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born alive
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what is ovoviviparous?
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eggs stay in mother's body
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what are the 3 groups of fishes?
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jawless, cartilaginous, and bony
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what is an example of the class chondrichthyes?
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sharks, rays, chimaeras
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what is a fish that spends most of life in saltwater, but breeds in fresh water?
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anadromous
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what is a fish that spends most of life in fresh water but breeds in salt water?
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catadomous
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what are 3 adaptations for amphibians?
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bones in the limbs, lungs, sternum
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when did amphibians become dominant?
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carboniferous period
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what are 3 groups of amphibians?
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salamanders, frogs/toads, caecilians
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what is the difference between how tadpoles and adults breathe?
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tadpoles: gills
adults: through skin |
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circulatory system for amphibians?
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closed with 3 chambers
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