A)make up more than three-fourths of all the known species of animals.
B)are more widely and more densely distributed throughout the world than members of any other phylum of animals.
C)are segmented eucoelomate protostomes with well-developed organ systems.
D)are limited in size and generally are smaller than 60 centimeters in length.
E)All of the choices are correct.

A)all arthropods,gastropods,and brachiopods.
B)just the millipedes and centipedes.
C)insects and their ancestors.
D)all arthropods except arachnids and crustaceans.
E)centipedes,millipedes,pauropods and symphylans but not insects.

A)as an ectoparasite on a whale.
B)grazing in kelp beds.
C)from intertidal zones to over 6000 meters deep,especially in polar waters.
D)as an endoparasite in the gut of echinoderms.
E)in underwater webs in coral reefs.