has a muscluar foot, bilateral symmetry & mantle
a membrane that surrounds the internal organs and can also secrete calcium carbonate to form a shell
toungue-like organ with rows of teeth used to scrape food
what type of digestive tract do mollusks have?
complete gut with mouth and an anus
open circulatory system
blood is pumped out of vessels and into open spaces usrrounding the body organs
closed circulatory system
blood is confined to vessels
get ride of metabolic watste in blood from cellular processes in mollusks
larval stage of mollusks
stomach footed mollusks with single shells like snails
head-footed mollusks like the octopus
what is a cephalopod?
segmented worms belog to which phylum?
stores food in an earthworm
muscular sac that grinds food in an earthworm
do annelids have an open or closed circualtory system?
3 examples of annelids
fan worm, leeech, earth worm
thicked band of segments that produces a coccon from which young earthworms hatch
tinybristles that push into the soil anchor a worm during movement
benefits of annelids
important diet of many predatorys, used as medical treatments, aerate soil
3 body regions of arthropods
head, thorax, abdomen
hard covering on ourside of arthpod;s body that provides a framework for support, protects soft body tissues, provides a place for muscles attachment and slows water loss; chitin
appendages in arthropods
structures that grow and estend from the body, jointed so more flexable movement
shedouter coverings in order to grow
mouth parts of arthropods
system of branching tubesin terrestrial arthopods that carry oxygen throughout the body
book lungs and what organism has them
saclike pockets with highly folded walls for respiration;spiders
flat membrane the vibrates in response to sound waves for hearing
chemicals secreated by animals species that influence the behavior of other animals of the same species
examples of crustaceans
crabs, shrimp, lobster, barnacle
free swimming larval stage of crustaceans
large claws in crayfish
3 examples of arachnids
ticks, spider, scorpions
what do spiders use spinnerets for?
2 mouthparts of arachnids
Celicerae- function as fangs or pinchers
Pedipals-used for sensing and holding pray
3 pairs of legs, wings, mouthparts, adapted to the foods they eat, antennae
4 stages of complete metamorphis
egg, larva, pipa, adult
what organisms are centipedes and millipedes relatives of?
can regenerate, spiny endoskeletons, radial symmetry
water vascular system of echinoderm
fluid-filled tubes that work together for movement and to get food
strainer-like opening to the water vascular system
small, muscular, fluid-filled tubes that end in suction-cuplike structures in echinoderms and are used in movement, food collectioin and respirations
examples of echinoderms
sand dollars, sea cucmbers, sea dasiy, sea lilies, sea stars, sea urchins
realationship in which one organism benefits and other other is neither helped nor harmed
chewing appparatus in sea urchins
4 characteristics of chordate
pharyngeal pouches, postanal tail, dorsal, nerve cord, notcochord
are most chordates vertebrates of invertebrates?
are lancelets and tunicates chordates?
do lancelets and tubicates have a backbone
describe respiration in echinoderms
some have skin, gills, oxygen can diffuse into tube feet, some have respiratory