(a(i))[1]
Magnesium is one nutrient needed by organisms. State a role of magnesium in organisms.
(a(ii))[2]
State what the double-headed arrow between plants and fungi shows about nutrient flow.
(b(i))[1]
State the trophic level occupied by these larger birds.
(b(ii))[2]
Some large animals feed on more than one trophic level. Suggest why this happens.
(c(i))[2]
Define community and habitat.
(c(ii))[3]
Suggest what is meant by the term "driving force for the environment".