Molluscs have all of the following except
A. visceral mass covered with a soft epithelium
B. folds enclosing a cavity between themselves and the visceral mass
C. gills or lungs within the mantle
D. individuals secrete a tiny chitinous chamber, zoecium
E. the shell consists of a horny outer layer, which is rich in protein
The nitrogenous waste in molluscs is removed by
A. flame cells B. nephridia C. the radula D. the muscular foot E. trochophores
Annelids possess all of the following except
A. muscles to swim, crawl, and burrow
B. ganglia to respond to light and respond to other environmental cues
C. circulatory, excretory, and neural elements in each segment
D. setae in each segment
E. adductor muscles
The evolutionary innovation that first appeared in arthropods and is characteristic of the most successful of all animal groups is that of
A. bilateral symmetry B. coelomic body architecture C. jointed appendages
D. segmentation E. three primary types of tissues