classifying animals
the fifth way of classifying animals on the classification chart
what is order
the word _______ means little rings
annelid
an animal of a large group distinguished by the possession of a ________
backbone
fused head thorax and abdomen
five pairs of appendages on the head, including two pairs of antennae
five pairs of legs
Each _____________ is a tiny bag of pigment encircled by muscles
chromatophore
what are the five main vertebrates
What are the 5 main vertebrates?
two body regions (cephalothorax and abdomen)
four pairs of legs
what are the major chacteristics of arachnida
many invertebrates have simple, light sensitive cells called ______
ocelli
what is the biggest group of vertebrates
fishes
bilateral symmetry (larva)
radial symmetry (adult)
what is the type of symmetry in the phylum echinodermata
males change their ______ to warn away other males or attract a female
colors
vertebrates have an ____skeleton
endo (skeleton)
spine is present
globe or disk-shaped body
used for movement
what is the body type and tube feet of sea urchins and sand dollars and if they have a spine
the term _______ literally means "two shells"
bivalve
vertebrates have two pairs of __________
appendages