Part 1: External Stimulus - Plants
http://plantsinmotion.bio.indiana.edu/plantmotion/movements/tropism/tropisms.html
Part 2: External Stimulus - Animals
http://www.nps.gov/dena/learn/education/classrooms/upload/Activity-Reading-Migration.pdf
Part 3: Homeostasis
http://newt.phys.unsw.edu.au/biosnippets/
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