Question

rising global temperatures affect marine ecosystems in the galapagos by...

1. helping fish populations thrive due to warmer waters.
2. expanding the habitat range for cold - water species.
3. causing coral reefs to bleach and die off.
4. increasing the population of coral reefs.

Explanation:

Rising global temperatures cause ocean - water warming. Coral reefs are highly sensitive to temperature changes. Warmer waters lead to coral bleaching, where corals expel the symbiotic algae living in their tissues and can eventually die off.

Answer:

causing coral reefs to bleach and die off.