Question

in the following food chain which organism will go on the 3rd trophic level of the energy pyramid: grass--> aphid--> spider--> bird --> sparrowhawk
bird
spider
aphid
grass
sparrowhawk

Explanation:

In a food - chain, the first trophic level is occupied by producers (grass here). The second is by primary consumers (aphid that eats grass). The third is by secondary consumers (spider that eats aphid).

Answer:

spider