Answer:
You need to know how population size is determined by births, deaths, immigration, emigration and limiting factors.
You need to be able to use data about population dynamics, abiotic factors, and biotic factors to explain a change in carrying capacity and population size in an ecosystem.
You need to know that different types of organisms exist within aquatic systems due to chemistry, geography, light, depth, salinity, and/or temperature.
You need to know the potential changes in an ecosystem resulting from seasonal variations, climate changes and/or succession.
You need to know the positive or negative consequences that result from a reduction in biodiversity.
