vocabulary+definitions


 * __Here are the definitions.__**


 * 1) **abdomen:** third section of an insect
 * 2) **anterior:** of or near the head end or toward the front plane of the body
 * 3) **asymmetrical:** irregular in shape or outline
 * 4) **bilateral symmetry:** mirror image
 * 5) **bivalve:** two shell
 * 6) **booklung:** used by spiders to get oxygen from air
 * 7) **budding:** asexual reproduction where a new organism grows and drops off of the parent
 * 8) **cephalothorax:** region of a crustacean formed by the fusion of the head with the thorax
 * 9) **chitin:** makes up exoskeleton of arthropods
 * 10) **chordate:** any animal of the phylum Chordata having a notochord or spinal column
 * 11) **circulatory system:** carries blood
 * 12) **closed circulatory system:** system in which blood is contained within a network of blood vessels
 * 13) **coelom:** body cavity where the organ systems are found
 * 14) **collar cells:** flagellated cells that push water through a sponge
 * 15) **crop:** stores food in earthworm
 * 16) **digestive system:** breaks down food
 * 17) **dorsal:** on the bottom or stomach side
 * 18) **ectoderm:** outer layer of cells
 * 19) **endoderm:** inner layer of cells
 * 20) **esophagus:** in earthworm leads from pharynx to crop
 * 21) **eukaryote:** cells with a nucleus
 * 22) **excretory system:** gets rid of body wastes
 * 23) **excurrent:** in aquatic mollusks lets water out
 * 24) **exoskeleton:** hard chitin covering
 * 25) **flame cells:** in flatworms get rid of nitrogen waste
 * 26) **foot:** in mollusks use for movement
 * 27) **ganglia:** simple brain in lower invertebrates
 * 28) **gastropod:** no shell or one shell
 * 29) **gastrovascular cavity:** a digestive cavity with only one opening; found in simple animals
 * 30) **gills:** used by mollusk to filter oxygen from water
 * 31) **gizzard:** grinds food in earthworm
 * 32) **head:** first section of an insect where brain is found
 * 33) **hermaphrodite:** one having both male and female sexual characteristics and organs
 * 34) **host:** an animal or plant that nourishes and supports a parasite
 * 35) **incurrent:** in aquatic mollusks brings water in
 * 36) **invertebrate:** animals without a backbone
 * 37) **larva:** caterpillar or worm shape of insects
 * 38) **mantle:** in mollusks covers the visceral mass
 * 39) **marine:** ocean
 * 40) **medusa:** umbrella shape of cnidaria
 * 41) **mesoderm:** middle layer of cells
 * 42) **metamorphosis:** the marked and rapid transformation of a larva into an adult that occurs in some animals
 * 43) **multicellular:** more than one cell
 * 44) **muscular system:** allows for movement
 * 45) **nematocysts:** stinging cells of cnidaria
 * 46) **nephridia:** organs in the earthworm that filter wastes from the blood
 * 47) **nerve net:** in cnidarians, a network of nerve cells that lacks a central control; impulses pass in any or all directions to produce a generalized response
 * 48) **nervous system:** controls nerves and brain
 * 49) **one-way digestion:** from mouth thru intestines and out other end
 * 50) **open circulatory system:** system in which blood is not always contained within a network of blood vessels
 * 51) **organ:** a group of tissues that work together
 * 52) **organelles:** small structures in the cytoplasm that do special jobs
 * 53) **osculum:** top opening of a sponge
 * 54) **parasite:** an animal or plant that lives in or on a host (another animal or plant)
 * 55) **pharynx:** the passage to the stomach and lungs
 * 56) **polyp:** cup shape of cnidaria, tentacles point up
 * 57) **posterior:** near the back end or tail
 * 58) **prokaryote:** cells without a nucleus
 * 59) **pupa:** an insect in the inactive stage of development (when it is not feeding) intermediate between larva and adult
 * 60) **radial symmetry:** arrangement of body parts around a central axis
 * 61) **radula:** mollusks use this to scrape food off of rocks and leaves
 * 62) **regenerate:** to regrow
 * 63) **reproductive system:** makes egg and sperm
 * 64) **respiratory system:** carries oxygen
 * 65) **sessile:** not moving
 * 66) **setea:** These bristles give the earthworm the ability to fasten itself to the soil.
 * 67) **shell:** in mollusks internal or external body support
 * 68) **spicules:** fibers that shape and support a sponge
 * 69) **spiricles:** passages used by insects to get oxygen
 * 70) **terrestrial:** land
 * 71) **thorax:** middle section of an insect
 * 72) **tissue:** a group of cells that work together
 * 73) **trachea:** leads from mouth to lungs
 * 74) **two-way digestion:** in mouth and out mouth
 * 75) **unicellular:** one cell
 * 76) **ventral:** on the top or backside
 * 77) **vertebrate:** animals with a backbone
 * 78) **visceral mass:** in mollusks the internal body organs
 * 79) **wandering cells:** In between outer and inner layer of sponge is a jelly like material which carries food
 * 80) **water vascular system:** system of fluid-filled tubes used by echinoderms in locomotion and feeding and respiration