closed		Jawless fish have no ____________.
water		_______ (type of cartilaginous fish) spend most of their time hunting.
buoyant force		What in a fish filters oxygen out of water?
fresh		The swim bladder contains gasses such as oxygen, nitrogen and ___________________.
jawless		The earliest vertabrates were _____________ fish.
stabilize		Today, there are only about 60 _______ of jawless fish.
swim		True or false. Bony fish make up 95% o fish species.
true		The ______ bladder is filled with gasses.
bony		Fish are in the phylum ________.
fins		_________ help fish swim.
scales		What do fish get their oxygen from?
heart		The __________________ is the force that water exerts upward on any underwater object.
species		The most familiar kind of fish are _________ fish.
external fertilization		Bony fish have skeletons made of hard _________.
cartilaginous		Bony fish live in salt and ______ water.
chordates		Fish have a(n)__________ circulatory system.
over fishing		The swim bladder helps a fish ____________ its body in different depts.
gills		Some countries are trying to stop ________________.
vertabrates		Sharks have ___________ fertilization.
shark		Fish are the biggest group of ____________.
internal		The ______ pumps in one continuous loop.
carbondioxide		Most fish have ____________________________.
bone		The skeleton of a _________________ fish is made of cartilage.