Question

multiple choice question
how are concentrations of oxygen in seawater measured directly in the oceans?
by collecting photosynthetic organisms and measuring their oxygen production capacity
by using traditional chemical techniques in the laboratory
by using a probe that sends an electronic signal back to a receiver on a ship or buoy

Explanation:

To measure oxygen concentrations directly in the ocean, a probe is used. This probe sends an electronic signal back to a receiver on a ship or buoy. Measuring oxygen - production capacity of photosynthetic organisms gives an indirect estimate related to oxygen production rather than direct measurement of oxygen in seawater. Using traditional chemical techniques in the laboratory requires water samples to be brought to the lab, which is not direct in - ocean measurement.

Answer:

By using a probe that sends an electronic signal back to a receiver on a ship or buoy