The second answer
Temperatures up high need to be warmer near the surface, surface air needs to be humid
Decreasing enzyme binding affinity by blocking the active site.
When the fish is put into fresh water, suddenly the concentration around them is very low and the water potential is extremely high. Water will now move from the relatively high water potential in the water to the relatively low water potential in the cells, the cells start to burst and the fish dies.
It’s the second one. H,D,C,F,B,G,E,A
