Question

how do coral reefs form?
a reef is made of living things. various species of coral have different shapes.
each coral is a group of tiny animals called polyps. polyps have long, arm - like
parts called tentacles. they capture prey with them. many coral species
release calcium carbonate. this compound hardens and forms an
exoskeleton around the polyp. a coral reef forms when the skeletons of many
coral join together. the reef expands as older coral die. the skeletons left
behind are a safe place where young coral attach and grow.
the reefs beautiful colors are not from the coral but from algae living within
of marine life. they protect
shorelines and reduce flood
and storm damage. they
support fishing and supply
food and medicines for
people. but coral reefs are in
danger. coral bleaching is
hurting them. scientists want
to help.
coral reefs attract scuba divers from all over the world. image
credit: simkan/stock/getty images plus
question 4
the reader can tell from the article that
a. environmental changes have no effect on the fishing
industry
b. scientists main reason to restore coral reefs is their
beauty
c. most scientists oppose efforts to reduce carbon dioxide in
the air
d. saving the worlds coral reefs will take a lot of time and
effort

Explanation:

The article discusses the importance of coral reefs (supporting marine life, protecting shorelines, etc.) and coral bleaching. It mentions that scientists want to help coral reefs. Option B is incorrect as the text doesn't focus on scientists' main reason being beauty. Option C is wrong because the text doesn't say scientists oppose efforts to reduce carbon dioxide in the air. Option A is incorrect as there's no indication environmental changes have no effect on fishing. Option D aligns with the idea that restoring coral reefs (which are complex and have been affected by various factors like coral bleaching, storm damage, etc.) would be a big task, taking a lot of time and effort.

Answer:

D. saving the world's coral reefs will take a lot of time and effort