A
parts of the animal's body match up with other parts around a midpoint
symmetry
an animal that has a backbone
vertebrate
how many invertebrate groups
8
simplest kind of invertebrate
sponge
does not have symmetry
sponge
an animal with armike parts
cnidarian
armlike parts are called these
tentacles
jellyfish and corals are part of this group
cnidarians
invertebrates with soft bodies
mollsks
how many arthropod groups
4
this has spiny skin
echinoderm
snails and slugs are parts of this group
mollusks
the internal support structure
endoskeleton
have jointed legs
arthropods
hard covering that protects the body
exoskeleton
clams, oysters, squid are parts of this group
mollusks
these worms have thin bodies with pointed ends
roundworms
these animals are the only mollusks that live on land
snails and slugs
the simplest worm
flatworms
which arthropod group has the most species
insects
crabs and shrimp are in this group
crustaceans
they have four pairs of legs and two body sections
arachnids
have one pair of antennae
insects
have two pairs of antennae and two to three body sections
crustaceans
exoskeleton