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blood doesn't remain only in blood vessels; it is pumped, but doesn't go back to the heart
one of the primary tissues of the embryo - becomes specialized as the animal grows and develops
the inner germ layer that develops into the lining of the digestive and respiratory systems
the middle germ layer that develops into muscle and bone and cartilage and blood and connective tissue
The bodies of many sponges have sharp structures called ________ that provide support and protection
specialized cell in sponges that uses a flagellum to move a steady current of water through the sponge
An organelle on a Cnidarian that has coiled spring w/ barbs and toxins - used to catch and stun prey
sessile stage of the life cycle of a cnidarian that has a tube shaped body and tentacles - anemones and coral stay in this stage
organism that filters small particles from water to get its food (that's a clam in the picture)
Located near the cerebral ganglia, planarians use this organ to sense the intensity and direction of light
opening at the anterior (front) end of the digestive canal. the way that flatworms get their food into the body
why must a terrestrial annelid have moist skin?
moist skin helps it breathe - earthworms use their skin for respiration
does a squid have a closed- or open- circulatory system?
closed! It needs to be able to pump blood back to the heart and around in order to move lots of O2 when it is swimming
does a clam have a closed or open circulatory system?
open! Clams are sessile filter feeders. They don't move much, so they don't need to move oxygen around their bodies fast.
pair of mouthparts in chelicerates that contain fangs and are used to stab and paralyze prey (they're black in this picture)
structure, such as a leg or antenna, that extends from the body wall and has joints where it bends
process that arthropods use to allow growth - shedding small shells and growing into larger soft shells
why a squid needs a closed circulatory system
uses lots of oxygen when it swims; needs to move blood fast
If this animal has a digestive tract and a shell and a closed circulatory system it is a(n)...
cephalothorax and abdomen are in which group(s) of arthropods?
crustaceans and chelicerates (spiders etc)
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