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asexual, individual from unfertilized egg
their legs like a grass hopper
branching network of air passage
holes in the thorax and abdomen allow air in and out
air-filled chambers contain leaf like plates
territorial arthropods excrete wastes through
most have two body regions with 4 pairs of walking legs, spin silk, some spread disease
ex. spider scorpions, mites, ticks
most are aquatic, have gills, typically have 2 body segments(green gland regulates salt in body)
ex. crabs, lobsters, barnacle, water fleas
carnivores, flattened wormlike, 2 pair of legs per body segment
herbivores, cylindrical worm, 2 legs per body segment
living fossils, unchanged for millions of years
most successful, 3 body segments, 3 pairs of walking legs