The postcard below shows an ecosystem. Why is water depth a limiting factor?
A. Shallow water has less dissolved salt, which can harm organisms that live in deeper saltier waters.
B. Sunlight does not penetrate deep water, so photosynthetic organisms compete for light in shallow waters.
C. Deep water does not provide much room for movement, which fish and other marine animals need for respiration.
D. Nutrients and gases that organisms need for respiration do not dissolve in water that is at high Pressures in deep water.
