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Bio CH7

Biology CH7 Simple Animals

anus an opening through which undigested food leaves the body
cyst a young worm with a protective covering
flatworm the simplest worms; they have flattened bodies
hookworm a roundworm that is a parasite of humans
invertebrate animals without backbones
mantel a thin, fleshy tissue that covers a soft-bodied animal
planarian a common freshwater flatworm that is not a parasite
pore a small opening in a sponge through which water enters
roundworm worms that have long bodies with pointed ends
segmented worm worms with bodies divided into sections called segments
soft-bodied animal animals with a soft body that is usually protected by a hard shell
sponge simple invertebrates that have pores
stinging-cell animal animals with stinging cells and hollow,sock-shaped bodies that lack organs
symmetry the balanced arrangement of body parts around a center point or along a center line
tapeworm a kind of flatworm that has a flattened, ribbon-like body divided into sections
tentacle armlike parts of stinging-cell animals
vertebrate animals with backbones