Question

1. how does the oxygen content of the ocean compare to the air that humans breathe?

depends on the depth of the water
no significant difference
depends on the salinity of the water
lower oxygen content
higher oxygen content

Explanation:

Oxygen is less soluble in water than in air. The oxygen content in the ocean is lower compared to the air humans breathe. The options "depends on the depth of the water" and "depends on the salinity of the water" refer to factors affecting ocean oxygen levels but do not directly compare to air. "No significant difference" is incorrect as there is a difference. "Higher oxygen content" is wrong as air has more oxygen.

Answer:

lower oxygen content