According to the article about coral reefs, which of the following problems is threatening the world’s reefs today?
a.
heavy winds
b.
freezing air temperatures
c.
rising sea temperatures
d.
lower pollution

The answer is b im not sure 

There’s no picture or character?

Your answer is d. silli hope this ! : ) i left an explanation down below if you need it: a sill forms when hot magma squeezes between layers of rock to form a hardened sheet of rock. a sill is basically a tabular sheet intrusion between old layers of sedimentary rock, volcanic beds, or in the direction of foliation inherent in metamorphic rock. the word sill means a concordant intrusive sheet.

D. coal i hope that