Question

Analyze the argument made in this passage.

Corals, the small sea creatures that form the spectacular coral reefs, are also endangered by global warming. As the ocean temperatures rise, the balance between corals and algae in the reefs is thrown off, and the corals die. Additionally, the oceans are becoming more acidic as they take in excess carbon dioxide from the air. Corals do not grow well in water with a high acid content. In the last twenty years, corals have already been affected all over the world. And since corals are a main food source for many sea animals, less coral could mean trouble for other marine life, including fish that humans eat.

Which sentence is the best summary of the argument in this passage?

Oceans maintain a delicate balance between the coral reefs and algae.

High levels of carbon dioxide in the air can make ocean water more acidotic.

Global warming is having a negative impact on coral reefs, as well as other marine life.

Coral reefs provide food and shelter for all types of marine life throughout the world.

Answer 1

Global warming is having a negative impact on coral reefs, as well as other marine life.

This best summarizes the passage's main point: rising temperatures and ocean acidification (from extra CO2) harm corals, which in turn threatens other marine species.