Phylum Chordata

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What are the four characteristics that all animals in phylum chordata have at some point in their life?
tail
hollow nerve chord
pharyngeal slits
notochord
What class includes jawless fish?
agnatha
What are the only two living species of jawless fish that still exist?
lamprey and hagfish
What class include cartilaginous fish?
Chondrichthyes
What class includes bony fish?
Osteichthyes
What type of mammals lay eggs?
monotremes
What characteristic does class aves have that no other does?
feathers
What is the purpose of mammary glands?
to produce milk
What are the four characteristics that all mammals share?
hair
mammary glands
three bones in middle ear
chewing jaw
What are some ways that birds are adapted to fly?
big sternum
wings
air sacs and an active metabolism
hollow bones
gonads only active at certain times
What do gills do?
Allow fish to breath by dissolved oxygen
Why can't adult frogs survive without water?
they have to lay their eggs in water so they don't dry out
What passes through chordates pharyngeal slits?
water
Which animals were the first tetrapods?
amphibians
The first recognizable vertebrates were ______.
fish
A fish's swim bladder help it do?
stay afloat
What membranous organ develops in female mammals during pregnancy?
plancenta
Jaws evolved from _____.
gill arches
What chordate classes are amniotes?
reptiles, birds, and mammals
A reptile's heart has ____ chambers, and allows them to maintain blood flow when they are not breathing.
three; two atriums and one ventricle
Mammals have ___ chambered hearts.
4; 2 atriums and 2 ventricles
How do mammals regulate temperature?
endotherms
What adaptation of early reptiles allowed vertebrates to evolve in land environments?
amniotic egg
Animals who's body temperature changes with the environment are called ______.
ectotherms
______ moves blood from the heart to the lungs.
pulmonary circuit
______ moves blood from heart to the rest of the body.
systemic circuit
Which class of chordata is coved in dry scales or plates?
reptiles
What order of mammal are you classified in?
eutharian