An experiment showed that the growth of pillar coral decreased in warm water in which other organisms blocked sunlight. Which conclusion can be
made based on these data?
A. Pillar coral do not need zooxanthellae or sunlight to survive.
B. Pillar coral are unable to eat or digest zooxanthellae.
C. Pillar coral need warm water so they can live free of
zooxanthellae.
D. Pillar coral need sunlight so the zooxanthellae inside them can
make food.