6.1 Digestion & Absorption (Includes Option D.1-D.3)

6.2 The Heart (Includes Option D.4)

6.3 & 11.1 Defense against Infectious Diseases

6.4 Gas Exchange (Option D.6)

6.5 Neurons & Synapses

11.2 Muscles & Movement

6.6 Hormones and Homeostasis ​(Option D.5)

11.3 The Kidney

6.6 and 11.4 Reproduction

Nature of Science for Topic 6, 11, Option D