I really need help with these Marine Science Questions.

1: Which ocean zone has the greatest temperature variation with increasing depth?

A: Bathypelagic zone
B: Abyssopelagic zone
C: Mesopelagic zone
D: Epipelagic zone

2: What abiotic components would most likely change in a deep ocean ecosystem during upwelling?

A: Increase in oxygen content
B: Decrease in oxygen content
C: Increase in competition
D: Decrease in competition

3: What property of water results from the high cohesion between water molecules?

A: Surface tension
B: Low density as a solid
C: Low vapor pressure
D: High heat capacity