The correct answer is option B, that is, water depth.
An aquatic ecosystem refers to an ecosystem, which is found in water. There are various kinds of the aquatic ecosystem, that is, lakes, rivers, wetlands, ponds, deep oceans, and shallow seas.
The chemical or physical components of the environment, which influences the species that are thriving in particular surroundings are known as the abiotic factors. In the case of aquatic ecosystems, the abiotic factors are the flow rate of water, the intensity of light, temperature, acidity, dissolved oxygen, salinity, and water depth.
Of these water depth plays the most significant role in determining the characteristics of aquatic ecosystems. The intensity of sunlight and the availability of the dissolved oxygen to the species depends on the depth of water in an aquatic ecosystem.
