CAIE IGCSE Biology EXTENDED 19.2.19 It is more energy efficient for humans
CAIE IGCSE Biology EXTENDED 19.2.19 It is more energy efficient for humans
Practise comparing crop plants, livestock and other food sources to explain which route gives humans more usable energy.
How this is tested
- compare crop and livestock food chains by counting trophic levels before humans
- explain why eating lower trophic levels saves energy lost in movement, heat and waste