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"Introduction to Organisms of Life." Organisms of Life: Plants, Animals, Fungi, Monerans and Protists Organisms. N.p., n.d. Web. 01 Dec. 2013
"The Evolution of Mammals." The Evolution of Mammals. N.p., n.d. Web. 01 Dec. 2013
"The Evolution of Mammals." The Evolution of Mammals. N.p., n.d. Web. 01 Dec. 2013
"The First Mammals." About.com Dinosaurs. N.p., n.d. Web. 01 Dec. 2013
"Introduction to Organisms of Life." Organisms of Life: Plants, Animals, Fungi, Monerans and Protists Organisms. N.p., n.d. Web. 01 Dec. 2013