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life science
chapter 11
17
Science
7th Grade
02/22/2012

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Term
chordates
Definition
vvertebrates like the ancient jawless fish are in this phylum subgroup.
Term
fish, amphibians such as frogs, reptiles such as snakes are vertebrate examples of this
Definition
chordates
Term
notochord
Definition
flexible rod that supports a chordate's back
Term
things chordata have
Definition
notochord, nerve in back, slits in throats
Term
vertebrate characteristics
Definition
has a backbone that is part of an internal skeleton.
Term
backbone
Definition
spine that runs down the center of the back
Term
vertebrae
Definition
similar bones line up in a rowe like beads on a string. 
Term
Internal Skeleton
Definition
aka endo skeleton. protects the body's organs. 
Term
Definition
an animal whose body does not produce much internal heat. cold blooded animals (although their blood is often quite warm)
Term
endotherm
Definition
an animal who's body regulates it's own temperature by controlling the internal heat it produces.
Term
fish
Definition
vertebrate that lives in water and uses fins to move
Term
fish
Definition
are ecotherms, obtain oxygen through gills and having scales. 
Term
how does a fish get oxygen
Definition
water moves through fish's throat region that lead to gills, gills move oxygen into fish's blood.
Term
structure of a fin
Definition
thin membrane stretched across a bony support, like a canoe paddle.
Term
reproduction of fish
Definition
most have external fertilization. eggs fertilized outside of body & hatch outside of body.
Term
3 main groups of fish
Definition
jawless, cartilaginous and bony
Term
jawless fish
Definition
no jaw or scales
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