http://www.pc.maricopa.edu/Biology/ppepe/BIO145/lab04_1.html http://www.pc.maricopa.edu/Biology/ppepe/BIO145/lab04_1.html http://www.pc.maricopa.edu/Biology/ppepe/BIO145/lab04_1.html shark pictures http://www.pc.maricopa.edu/Biology/ppepe/BIO145/lab04_1.html http://www.pc.maricopa.edu/Biology/ppepe/BIO145/lab04_1.html