Chapter 12 - Fish, Amphibians, Reptiles

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vertebrate

an animal with a backbone

ectotherm

an animal that cannot regulate its own body temperature, it must depend on the temperature outside its body

endotherm

an animal that generates its own body heat and controls its body temperature from within

cartilage

strong connective tissue that supports the body and is softer and more flexible than bone

fossil

the preserved remains or traces of an organism that lived in the past

sedimentary rock

a type of rock that forms when particles from other rocks or the remains of plants and animals are pressed and cemented together

fish

an ectothermic animal that lives in water, breathes oxygen through gills, and has fins for swimming

bony fish

fish that have bony skeletons, paired fins, scales, jaws, and some have teeth; goldfish and salmon are examples

jawless fish

fish that have round suction cup mouths, rasping tongues, some have teeth, no scales, and they suck body fluids from other animals

Cartilaginous fish

sharks, rays, and skates; fish that have carilaginous skeletons, jaws and teeth, all are carnivores

swim bladder

a small sac in a bony fish that can be inflated with air to help a fish swim at shallower depths, or deflated to help the fish sink to deeper water

buoyant force

the force that water pushed up on any object under water

amphibian

an ectothermic vertebrate that starts life in the water, lives in water during a larval stage, then undergoes a metapmorphosis to be able ot live its adulthood on land

atrium

an upper chamber of an amphibian or reptile heart

ventricle

the lower chamber in an amphibian or reptile heart

habitat

the place where an organism lives and can get all the things they need to survive

reptile

an ectothermic vertebrate that lays eggs and has lungs and scaly skin

urine

fluid wastes removed from the body, made by the kidneys

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