30 POINTS Refer to the Newsela article "Climate Change in Hawaii and U. S. Tropical Islands."
What is the author's purpose in mentioning coral reefs in the article?

A. to explain how climate change is damaging the delicate ecosystem in coral reefs

B. to suggest that algae and not climate change is responsible for the decline in coral reefs

C. to point out that coral reefs were already endangered before climate change

D. to illustrate how rising sea levels and coral reefs are creating climate change

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the present continuous is a verb tense which is mainly used to indicates that an action is in progress at the moment of speaking.  

it is formed using: person + verb to be (am/is/are) +verb + - ing form  

example: i am studying at this moment .

in addition, the present continuous is also used in order to express things that will or will not happen in the near future.

example: i am having dinner with some friends tonight.

the speaker sometimes   uses it   to express that an action is repeated and it causes irritation on the part of the speaker

example: my sister is constantly complaining about everything.

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