Many gastropods have external shells composed of:
a. two valves.
b. eight overlapping valves.
c. a series of internal chambers.
d. one valve.
e. chitin.
D
You might also like to view...
What is the name given to the type of cartilage that is found in the disks between the vertebrae?
a. chondrocytes b. elastic c. compact d. hyaline e. fibrocartilage
You hang a microscope slide from a submerged, L-shaped PVC pipe in lake water that is 2 feet deep. The slide hangs 6 inches below the surface of the water and remains there for eight weeks. When you remove it and bring it to your lab for observation, you
see that algae, bacteria, and even some fungi have colonized the slide. You determine that you are looking at a(n) A) biofilm. B) community of eukaryotes. C) biological weapon. D) endotoxin.
The tropics are warmer than the temperate regions because
A. they are at a higher altitude and closer to the sun. B. they are closer to the moon. C. there is less wind there to cool it. D. the sun's rays strike at a direct angle. E. the sun's rays strike at an oblique angle.
Who conducted the famous "imprinting" experiment on geese?
A. Mendel B. Lorenz C. Darwin D. Raven E. Russel