B............................................................................
Hey there!
The answer is D, Salinity.
Salinity is the concentration of salt in water. Ocean water often has high salinity and this can contribute to things like upwelling and water density- but these all start from salinity.
Hope this helps!
Answer:
I also have this question but see the 69 page of ur question book
It is a graph. It shows observations and then you record your results with any of the graph types.