(a(i))[3]
Put ticks (✓) in the boxes to indicate the correct descriptions of the organisms in Fig. 4.1.
(a(ii))[2]
Construct a food chain from Fig. 4.1 made up of four organisms, with the octopus included.
(a(iii))[1]
Identify one organism in Fig. 4.1 that feeds at both the second and third trophic levels.
(b)[1]
State the name of the type of organism that gains its energy from dead organic material.
(c)[1]
State the principal source of energy for most biological systems.
(d)[3]
Outline the ways humans can directly impact food webs.