“Blue-green Algae.” Encyclopaedia Britannica Online [Encyclopaedia Britannica]. N.p., n.d. Web. <http://school.eb.com/levels/high/article/15751>.
“Homo Sapiens.” Encyclopaedia Britannica Online Academic Edition [Encyclopaedia Britannica]. N.p., n.d. Web. <http://school.eb.com/levels/high/article/40899>.
“Paramecium.” N.p., n.d. Web. <http://school.eb.com/levels/high/article/58403>.
“White Tailed Deer.” Encyclopaedia Britannica Online [Encyclopaedia Britannica]. N.p., n.d. Web. <http://school.eb.com/levels/high/article/76848>.