Hello, i am to this application i hope you take your time to me answer something so easy

¡this is science but i don't find the subject that goes in the application!

Witch one is it soo it the the question b.a,b,c,d

What evidence does the writer give to support his argument about coral reefs? a) he speaks of the activities of coral polyps. b) he describes the composition of the great barrier reef. c) he emphasizes the ways in which coral reefs are fragile. d) he points out the ways that scientists do research on the reefs.

Why is canada's east coast a great fishing area? will name brainliest and 30