It is important for scientists to learn as much as possible about El Niño because the weather pattern

El Niño changes ocean temperatures and weather patterns, which can affect ecosystems, organisms, and land in many regions. Learning more about it helps scientists understand and prepare for these widespread effects. The best choice is “has so many effects on organisms and land”; it is not limited to North America or to study in the open ocean.

AI-written and checked against the verified answer.