Question

saving the coral reefs article in achieve3000
What cause-and-effect relationship is described in this article?

Environmental changes enable algae to provide nutrients for the coral.
Algae respond to stress by encasing themselves in an exoskeleton.
Increased salt content in ocean water protects coral shells from acidity.
The burning of fossil fuels emits carbon dioxide into the atmosphere.

Answer 1

The correct answer is: The burning of fossil fuels emits carbon dioxide into the atmosphere.

Explanation: The article links human burning of fossil fuels (cause) to increased CO2 in the air (effect), which leads to warming and ocean acidification that harm coral reefs. The other choices misstate how coral and algae respond or give incorrect effects.