Answer:
Lion.
Step-by-step explanation:
Species A and B are the plants which are eaten by the primary consumer is called herbivore such as rabbit, zebra and deer. The specie C, D and E are the primary consumer which belongs to second trophic level. The specie F feeds on specie E and D so it is called carnivores and belongs to third trophic level. In the food web, Specie C is rabbit, specie D is zebra and specie E is deer. Lion is the specie F which feeds on both zebra and deer. The name of secondary consumer in the food web is lion.