A. The rate of photosynthesis depends on light intensity, and light intensity falls off with increasing water depth. B. Greater numbers of oxygen-consuming organisms that do not photosynthesize are found at the bottoms rather than the surfaces of aquatic environments.
C. Oxygen preferentially collects at the surface of aquatic environments, leaving deep water oxygen-free.
D. Increasing water pressure at greater depths increasingly inhibits the rate of photosynthesis.

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Use the drop-down menu to match the following definitions to the corresponding terms. the total variety of organisms that live in the biosphere a group of organisms that breed and produce offspring that can breed all of the biotic and abiotic factors in an area

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Which is an advantage of having memory cells when a pathogen is encountered for a second time. a) the memory cells are what proliferate into clones of cells in response to the binding of an antigen. b) memory cells are vital to the primary immune response in that they immediately recognize pathogens even at the first encounter. c) memory cells are essentially effector cells that are short lived and attack antigens even without having a receptor specific to that antigen. d) it ensures that more lymphocytes with a receptor specific to a particular antigen will be present than in a host that had never encountered that pathogen.