Zooxanthellae are essential to reef-building corals because they:
A、Helpinthedepositionofthecalcium-carbonateskeleton;
B、Filter-outharmfulsolarradiation.;
C、Providethecoralwithprotectionfrompredators;
D、Providethecoralwithcarbondioxide.
发布时间：2025-06-01 21:24:19
