Theme | VD N (%) | D N (%) | E N (%) | VE N (%) |
Ecosystem | 3 (5.9%) | 2 (3.9%) | 7 (13.7%) | 39 (76.5%) |
Nutrition | 2 (3.9%) | 8 (15.7%) | 18 (35.3%) | 23 (45.1%) |
Acid and base | 5 (9.8%) | 6 (11.8%) | 21 (41.2%) | 19 (37.3%) |
Electricity and magnetism | 8 (24.2%) | 12 (36.3%) | 8 (24.2%) | 5 (15.2%) |
Force and motion | 21 (63.6%) | 5 (15.1%) | 4 (12.1%) | 3 (5.9%) |
Heat | 15 (45.5%) | 8 (24.2%) | 8 (24.2%) | 2 (3.9%) |