Hard AP Biology Question???

Question

Coral bleaching occurs

a. when an extreme low tide exposes coral reef to the sun.

b. as a result of sedimentation on a coral reef.

c. when symbiotic microalgae are expelled from coral polyps.

d. when symbiotic microalgae that live inside the coral polyps lose their chlorophyll

Answer 1

Coral bleaching refers to the loss of color of corals, due to stress-induced expulsion of symbiotic unicellular algae or due to the loss of pigmentation within the algae.

Best answer = c and d.

Answer 2

c

Answer 3

c. when symbiotic microalgae are expelled from coral polyps.