| A | B |
|---|
| two great lineages of animals based on the way their embryos develop | Protosomes & Deuterosomes |
| Three phyla of animals which are deuterosomes | mollusca, annelida, arthropoda |
| two phyla of animals which are protosomes | echinodermata, chordata |
| type of cleavage protosomes undergo in their development | spiral |
| type of cleavage deuterosomes undergo in their development | radial |
| what the first body opening in protosomes develops into | the mouth |
| what the first body opening in deuterosomes develops into | the anus |
| how the formation of the coelom differs in protosomes and deuterosomes | protosomes- arises from mesoderm deuterosomes- arises from outpouchings of the gut wall |
| bilateral, small coelom, fleshy soft body, most shelled by mantle, special gills, fleshy foot, many have tonguelike radula for feeding | mollusks |
| phylum name for mollusks | mollusca |
| four classes of mollusks | chitons, gastropods, bivalves, cephalopods |
| class of mollusks which have a two-valved shell | bivalves |
| term for the irridescent lining of bivalve shells | mother of pearl |
| class of mollusks which includes predators like squid and octopus | cephalopods |
| possible explanation for the ancestors of mollusks potential to divesify | soft fleshy bodies |
| the tissue unique to mollusks | mantle |
| reason cephalopods may have lost their external shells and streamlined and highly active | to compete with the explosion of boney fishes |
| term to descripe cephalopod locomotion | jet propulsion |
| bilateral, coelomate, segmented worms, with complex organ systems | Annelids |
| phylum name for the segmented worms | Annelida |
| advantages of segmentation for evolutionary potential | individual segments can undergo modification and become highly adapted for specific tasks |
| benefit of earthworms to many plants | they collectively aerate the soil and bring nutrients to the surface |
| value of lfluid filled coelomic chambers to the earthworm | serve as a hydrostatic skeleton for motion |
| two sets to earthworm muscles used for locomotion | circular and longitudinal |
| term for the projections found on most earthworm segments | bristles |
| earthworm structures which regulate composition and volume of body fluids | nephridia |
| term for the aggregation of nerve cell bodies in the head end of an earthworm | rudimentary brain |
| term for paired bundles of long extensions of nerve cell bodies leading away from the earthworm brain | nerve cords |
| type of circulatory system found in earthworms | closed |
| type of circulatory system in which blood is confined in hearts and muscularized blood vessels allowing for contractions to keep the blood moving in one direction | closed |
