(Opening image copyright by Derek Ramsey, http://en.wikipedia.org/wiki/File:Monarch_Butterfly_Danaus_plexippus_Feeding_Down_3008px.jpg, and under the GNU-FDL 1.2 license.)
Lesson 4.1: Energy for Life
Lesson 4.2: Photosynthesis: Sugar as Food
Lesson 4.3: Powering the Cell: Cellular Respiration
Lesson 4.4: Anaerobic Respiration
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