Question

why has the temperature of the arctic ocean changed during the last 40 years? (1 point)
sea ice has melted, allowing more sunlight to hit the ocean.
less snow falls in the arctic now than 40 years ago.
sea ice has produced more salt, causing the cold ocean water to sink.
more sunlight now reaches earth than in the past.

Explanation:

Sea - ice acts as a reflective surface. When it melts, the darker ocean surface absorbs more sunlight, leading to warming. This is a key factor in the Arctic Ocean's temperature change over the last 40 years. The other options are not the main reasons for the temperature change.

Answer:

Sea ice has melted, allowing more sunlight to hit the ocean.