references
a d d i t i o n a l o n l i n e r e s o u r c e s
Want to learn more about the digestive system? Here's something to get you started!
r e f e r e n c e s
T. Audesirk and G. Audesirk, 1996. Biology Life on Earth Fourth Edition. Prentice Hall, Upper Saddle River, N.J.
J.L. Gould and W.T. Keeton, 1996. Biological Science. W.W. Norton and Company, N.Y.
P. Raven and G. Johnson, 1995. Understanding Biology Third Edition. Wm C. Brown Communications, Inc. Toronto.
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