Over the next 12 hours (at 12Z on January 2), the 500-mb heights are predicted to decrease over the pocket of maximum cold-air advection. Explain, in your own words, WHY the 500-mb heights should decrease due to cold air advection. Hint: You must address the rate that pressure decreases with increasing altitude as a function of temperature in your explanation.

The answer is d., a mountain.

Ithink its b but i'm not sure.

Answer is b)eutrophication occurs when excess nutrients are present in aquatic ecosystems, resulting in the increased production of plant life and the subsequent decrease in the oxygen levels of the watereutrophication occurs when there are excess nutrients in a body of water. this results in plants having more food and reproducing  more, sometimes leading to more aquatic animal life as well. ultimately, this can reduce the oxygen level in the ecosystem.