- Terrestrial (wide range of conditions) / spiders: brown recluse and black widow, scorpions, ticks, mites, "granddaddy long legs"
- terrestrail, freshwater, saltwater / pill bugs*, lobsters, crabs, shrimp, crayfish
- Terrestrial, moist soil, under debris / segmented and rounded body, two pairs of legs per segment, short antennae, scavengers on plant material
- Terrestrial, moist soil, under debris / segmented and flattened body, one pair of legs per segment, antennae, poison claws, predators
- 2 body segments: (simple eyes) cephalothorax and abdomen, 4 pairs of legs and pedipalps, predators, most with fangs and venom, book lungs and spinnerets= spider parts
- Freshwater, saltwater, land / tunicates, lancelents, vertabrates (all sub-phyla)
- Tubular bodies/pointed ends, bilateral symmetry, internal fertilization, more advanced systems, 2 digestive openings with a complete connecting tube within a body cavity*
- Solid/flattened body, 1 digestive opening, bilateral symmetry*, some symmetry, internal fertilization
- Dorsal nerve cord, ventral heart/closed circulation, endoskeleton, large/complex organ systems
- Bilateral symmetry, complex systems/true coelom*, muscular foot, many have shells(valves), internal fertilization
- mostly salt water / hollow pouch, 3 cell layers (no tissue), no symmetry, non-motile, external fertilization (hermaphodite)
- Tubular bodies/segments*, bilateral symmetry, internal fertilization, complex organ systems, true body cavity
- bilateral symmetry, jointed legs* & segments, exoskeleton, complex systems, many have wings, many have metamorphosis, internal fertilization
- Fresh and salt water, moist soil, parasites(internal) / planarians, flukes, tapeworms
- Complex cell division in embryo*, endoskeleton, radial symmetry, external fertilization, water vascular system
- Hollow body/true tissues*, 1 digestive opening, mouth and tentacles, nematocysts, radial symmetry, external fertilization
- scales in cartilaginous fish (chondrochtyes) are
- fish migrating from lakes into rivers or streams (only freshwater) is called
- Weberian apparatus (weberian ossicles) in fish acts as
- fish that breed at sea and live in rivers is