10.Natural Resources 4.Excretion– The Waste Disposing System 9.Our Environment – Our Concern 2.Respiration– The Energy Releasing System 3.Transportation – The Circulatory System 1.Nutrition – Food Supplying System 8.Heredity 7.Co-ordination in Life Processes 6.Reproduction – The Generating System 5.Co-ordination – The Linking system
