REFERENCES
Books
Reece, Campbell. Campbell Biology: AP Edition. 9th ed. S.l.: Benjamin-Cummings, 2012. Print.
Glance Biology: New Mexico Edition. Columbus: McGraw Hill Education, 2012. Print.
Websites
Sará, Michelle. "Sponge." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 6 May 2015.
<http://www.britannica.com/EBchecked/topic/560783/sponge>.
Cadet, Hand. "Cnidaria." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 6 May 2015.
<http://www.britannica.com/EBchecked/topic/122750/cnidarian>.
Smyth, James. "Flatworm." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 6 May 2015.
<http://www.britannica.com/EBchecked/topic/209735/flatworm>.
"Rotifer." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 6 May 2015.
<http://www.britannica.com/EBchecked/topic/510626/rotifer>.
"Nematode." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 6 May 2015.
<http://www.britannica.com/EBchecked/topic/408450/nematode>.
"Annelid." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 6 May 2015.
<http://www.britannica.com/EBchecked/topic/26308/annelid>.
"Arthropod." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 6 May 2015.
<http://www.britannica.com/EBchecked/topic/36943/arthropod>.
"Echinoderm." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 6 May 2015.
<http://www.britannica.com/EBchecked/topic/177910/echinoderm>.
"Chordate." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 6 May 2015.
<http://www.britannica.com/EBchecked/topic/114462/chordate>.
Reece, Campbell. Campbell Biology: AP Edition. 9th ed. S.l.: Benjamin-Cummings, 2012. Print.
Glance Biology: New Mexico Edition. Columbus: McGraw Hill Education, 2012. Print.
Websites
Sará, Michelle. "Sponge." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 6 May 2015.
<http://www.britannica.com/EBchecked/topic/560783/sponge>.
Cadet, Hand. "Cnidaria." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 6 May 2015.
<http://www.britannica.com/EBchecked/topic/122750/cnidarian>.
Smyth, James. "Flatworm." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 6 May 2015.
<http://www.britannica.com/EBchecked/topic/209735/flatworm>.
"Rotifer." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 6 May 2015.
<http://www.britannica.com/EBchecked/topic/510626/rotifer>.
"Nematode." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 6 May 2015.
<http://www.britannica.com/EBchecked/topic/408450/nematode>.
"Annelid." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 6 May 2015.
<http://www.britannica.com/EBchecked/topic/26308/annelid>.
"Arthropod." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 6 May 2015.
<http://www.britannica.com/EBchecked/topic/36943/arthropod>.
"Echinoderm." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 6 May 2015.
<http://www.britannica.com/EBchecked/topic/177910/echinoderm>.
"Chordate." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 6 May 2015.
<http://www.britannica.com/EBchecked/topic/114462/chordate>.