Question

the great barrier reef, located near australia, is made up of over 2,000 individual coral reefs. thousands of different species of plants and animals live there. one explorer described the reef as \a wall of coral rock\ in the ocean. this \wall\ makes it difficult for ships to pass through. in fact, there have been at least 30 major shipwrecks there. why is the word barrier a good word to include in the name of this reef? options: it is difficult to pass through. one explorer discovered large rocks there. it is made up of smaller coral reefs. many plants and animals live there.

Explanation:

The term "barrier" refers to something that blocks passage. The text states the reef acts as a "wall of coral rock" that makes ship passage difficult, which matches the definition of a barrier. The other options do not relate to the meaning of "barrier".

Answer:

A. It is difficult to pass through.