What will happen to the temperature in your decomposition layer if
decomposition actually occurs in your
ecocolumn?
A stay tte same
C stay exactly 75 degrees Fatsettet
D. Decrease significantly

This question has already been answered by someone else.here is a link.  hope that it .

B. the west has a variety of climates and many different biomes

The salinity of ocean water increases with depth as the lower we go there will be more salt which has settled down, as the ocean depth increases the pressure also increases as more water is pushing down on you.