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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A. The rate of photosynthesis depends on light intensity, and light intensity falls off with increasing water depth.

Explanation:

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so, when you eat, your teeth chew and grind food into smaller pieces. this is mechanical digestion. then reactions aided by digestive enzymes break down large food molecules into smaller molecules. this is chemical digestion. the two processes change the food into simpler substances that can be used by the body for raw materials and energy.

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tobey

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