Question

correct the text by inserting one comma. the great barrier reef is a fragile ecosystem so climate change is a major threat to the systems health.

Explanation:

When two independent clauses are joined by a coordinating conjunction (here, "so"), a comma should be placed before the conjunction. This helps in clearly separating the two related but distinct ideas.

Answer:

The Great Barrier Reef is a fragile ecosystem, so climate change is a major threat to the system's health.