Animals 3

5. hard, flexible crust. Exoskeleton. Lobsters and crabs are giants of the subphylum.
9. do not actually have 1,000 legs as their name implies, most only have about 100.
12. circulatory system with blood confined in hearts and muscularized blood vessels.
14. scavengers. They ingest moistened soil and mud containing decomposing material. Each can eat its own weight every 24 hours.
16. recognizable by their (usually five-point) radial symmetry, and include such well-known animals as starfish, sea urchins, sand dollars, and sea cucumbers, as well as the sea lilies or "stone lilies".
18. less than 2 mm long and the most numerous animals in aquatic habitats, perhaps even in the world.
20. have segments fused into a forebody and hindbody. land creatures include spiders, scorpions and ticks.

1. have suckers at both ends. Most have sharp jaws and a blood sucking device. Doctors used them for at least 2,000 years.
2. centipede hides out in buildings where it hunts cockroaches, flies and other pests. mainly eat other insects and spiders.
3. most successful organisms on earth. greatest number of species, producing the most offspring, occupying the most habitats, and the capacity to exploit the greatest amounts and kinds of food. 4 major categories
4. a stage in the life cycle of a butterfly.
6. large, prey seizing pincers. Venom dispensing stinger. can live in cold places, such as Canada.
7. Only arthropod with a calcified shell protecting them from predators, drying winds, battering surf and strong currents.
8. have a flattened body, and all but two segments have a pair of walking legs. have between 15 and 177 pair of legs.
10. lungs are the main respiratory organ in most arachnids. small openings in the abdomen of the arachnid.
11. Among the arachnids, some of the smallest, most diverse, and most widely distributed.
13. larva feed on corn roots until the plants fall over. Causes a billion dollars a year in crop damage in America.
15. Insects get rid of waste material through small tubes connected to their midgut.
17. have a head, thorax and abdomen. The head has paired sensory antennae, and paired mouth parts. bite, chew, suck and puncture.
19. reinforced bristles on each side of the body of annelids.