Photosynthetic Single-Celled Dinoflagellates, Called Zooxanthellae, Live Within Coral Polyps

Photosynthetic single-celled dinoflagellates, called zooxanthellae, live within coral polyps.Zooxanthellae use CO₂ and nitrogenous wastes from the polyps to form oxygen and sugars, which in turn are used by both polyps and zooxanthellae for metabolism.As water temperatures warm, polyps eject their zooxanthellae, causing the coral to turn a bleached white.Corals slowly starve without zooxanthellae.As climate change causes warmer waters, we may expect to see a(n) _______ in corals as the number of zooxanthellae _______.

A) increase; increases
B) increase; decreases
C) decrease; decreases
D) decrease; increases
E) population stabilization; levels off

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