A friend of yours visited a natural history museum that had a replica of the Archaeopteryx. She told you the characteristics of Archaeopteryx that she either noticed or read at the display. Which one did she misread?

In their basic body plan, mollusks have a visceral mass covered with a soft epithelium and a muscular ________ that is used in locomotion.

What do echinoderms and chordates have in common?

Squids and octopuses move by means of water movement through their

Which of the following organs of cephalopods resemble those of the vertebrates?

The changes that were necessary to cope with the heavy energy demands of flight in birds include all of the following except

The organ that performs filtration of blood, reabsorption, and secretion in vertebrates is the ________.

All of the following are either structures or characteristics of members of the Class Bivalvia of the Phylum Mollusca except

Scorpions have pedipalps that are modified into claws, and chelicerae. Which taxonomic group are they a member of?

A friend asks you to explain the difference between atherosclerosis and arteriosclerosis. You say, “Well