animal anatomy quiz

invertebrate

95% of animals

no backbone

radial symmetry

organisms are symmetrical in rings moving out from the center (similar parts arranged around central point)

ex: starfish

bilateral symmetry

organisms have paired appendages and features that are divided by a line down the middle

ex: humans

cephalization

complex animals tend to have their sense organs and nervous tissue concentrated to the front of the body

cephalo refers to

the head

coelom

an internal body cavity that is lined with epithelial tissue (pillow for organs)

blastula

ball of cells that an animal forms from

blastopore

folding in of the blastula/ becomes the digestive tract

protostome

an animal whose mouth develops first from blastopore

deuterostome

an animal whose anus develops first from blastopore

heterotroph

eats things

agnatha

jawless fish

chondrichthyes

cartilaginous fish

osteichthyes

bony fish

amphibia

frogs, salamanders, toads

reptilia

snakes and lizards

aves

birds

mammalia

humans, dogs, cows

anatomy

structure of animals and plants