References

Graphics
http://www.dfw.state.or.us/mrp/shellfish/razorclams/index.asp
https://www.flickr.com/photos/genny164/6095094273/
http://animalplanet.wikispaces.com/snydercrago+clam+dissection
http://js082.k12.sd.us/My_Classes/Advanced_Biology/Ch_25/Clam%20Dissection/Clam_Dissection.htm
http://www.biologyjunction.com/clam_dissection.htm
http://www.backcountrygallery.com/photos/eye-to-eye-with-a-frog/
http://en.wikipedia.org/wiki/Frog
http://www.savalli.us/BIO370/Anatomy/4.FrogDissectionLabel.html
http://www.tutorvista.com/content/biology/biology-iii/animal-morphology/vertebrate-features.php
http://www.theanimalfiles.com/amphibians/toads/american_toad.html
http://en.wikipedia.org/wiki/Hard_clam
http://www.lookd.com/frogs/anatomy.html
http://w3.shorecrest.org/~Lisa_Peck/MarineBio/syllabus/ch7invertebrates/Invertwp/2007/josh/Nerv.html
http://hillegifted.wikispaces.com/science
https://animalplanet.wikispaces.com/GodoPascuzzo+Invertebrate+reflection+and+analysis
http://www.infovisual.info/02/