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35 Cards in this Set

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invertebrate
animal that does not have a backbone, or vertebral column
radial symmetry
body plan in which body parts repeat around the center of the body; characteristic of sea anemones and sea stars
bilateral symmetry
body plan in which only a single, imaginary line can divide the body into two equal halves; characteristic of worms, arthropods, and chordates
cephalization
concentration of sense organs and nerve cells at the front of an animal's body
spicule
spike-shaped structure that makes up the skeletons of harder sponges; made of either calcium carbonate or silica
larva
immature stage of an organism that looks different from the adult form.
gemmule
group of archaeocytes surrounded by a tough layer of spicules; produced by some sponges
polyp
usually sessile stage of the life cycle of a cnidarian that has a cylindrical body with armlike tentacles
medusa
motile stage of the life cycle of a cnidarian that has a bell-shaped body
hydrostatic skeleton
layers of circular and longitudinal muscles, together with the water in the gastrovascular cavity, that ecable movement
coelom
fluid-filled body cavity lined with mesoderm
hermaphrodite
individual that has both male and female reproductive organs
septum
internal wall between the segments of an annelid's body
seta
bristle attached to the segments of many annelids
crop
in earthworms, part of the digestive system in which food can be stored; in birds, structure at the lower end of the esophagus in which food is stored and moistened
gizzard
in earthworms, part of the digestive system in which food is ground into smaller pieces; in birds, a muscular organ that helps in the mechanical break down of food
mantle
thin layer of tissue that covers most of a mollusk's body
shell
structure in mollusks make by glands in the mantle that secrete calcium carbonate
radula
tongue-shaped structure used for feeding by snails and slugs
siphon
tubelike structure through which water enters and leaves a mollusk's body
exoskeleton
external skeleton; tough external covering that protects and supports the body many invertebrates
chitin
complex carbohydrate that makes up the cell walls of fungi; also found in the external skeletons of arthropods
appendage
structure, such as a leg or antenna, that extends from the body wall
spiracle
small opening located along the side of the body through which air enters and leaves the body of many terrestrial arthropods
book lung
organ that has layers of respiratory tissue that is used by some terrestrial arthropods for the exchange of gases
molting
process in which an arthropod sheds its exoskeleton and manufactures a larger one to take its place
incomplete metamorphosis
type of insect development characterized by a similar appearance throughout all stagesof the life cycle
complete metamorphosis
type of insect development in which the larvae look and act nothing like their parents and also feed in completely different ways
nymph
immature form that lacks functional sex organs and other adult structures
pupa
stage of metamorphosis in which an insect changes from a larva into an adult
society
group of closely related animals of the same species that work together for the benefit of the group
caste
group of individual insects specialized to perform particular tasks, or roles
pheromones
specific chemical messenger that affects the behavior or development of other individuals of the same species
endoskeleton
structural support located inside the body of an animal
tube feet
suction-cuplike structure attached to radial canals of echinoderms; used to walk and to open shells