You take at least three recommended options (see below) and one other suitable option.
List of Recommended options:
Option A Marine Ecosystems, Marine Microbiology, Tropical Marine Biology
Option B Animal Design, Marine Microbiology
Option C Behavioural Ecology, Freshwater Ecology, Marine Microbiology
Option D Applying Ecology - Conservation And Management Of Populations, Fisheries And Aquaculture, Marine Microbiology