What is a direct cause of coral bleaching?

a)
exposure to sunlight
b)
the loss of symbiotic algae
c)
overgrazing by fish
d)
exposure to transport vessels
e)
all of the above

B) the loss of symbiotic algae

Explanation:

The coral polyps lives in symbiotic association with the algae zooxanthellae. The presence of algae over the coral reefs is necessary for the calcification of the coral skeletons. It is necessary for the health of the reef and the coral. In certain unfavorable marine environmental conditions the bleached corals will expel out the algae. The algae also imparts color to the coral reefs in the absence of the algae the coral reef get bleached or devoid of any color.

Option B: The loss of symbiotic algae

Explanation:

I got it right lol

answer: 21

step-by-step explanation:

divide 630 by 30. 30 goes into 630 21 times

can you make it bigger i can't see it