What prediction is most likely, based on the data?
in the ocean, as salinity increases, temperature increases.
organisms that require a steady salinity move freely between sea level and -0.4 km.
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ocean salinity decreases at depths greater than -1.8 km below the surface.
organisms that require a temperature at 5°c will thrive -0.6 km below the surface.

Organisms that require a temperature at 5°C will thrive -0.6 km below the surface.

Explanation:

Let's evaluate the options:

-In the ocean, as salinity increases, temperature increases: False because based on the data we can see that as salinity increases, the temperature tends to decrease.

-Organisms that require a steady salinity move freely between sea level and -0.4 km: False because you can see that salinity has a big variation in the range between sea level and -0.4 km.

-Ocean salinity decreases at depths greater than -1.8 km below the surface: False because in the graphs you can see that salinity is at the highest point showed of 34.6 at depths greater than -1.8 km.

-Organisms that require a temperature at 5°C will thrive -0.6 km below the surface: True because at -0.6 km below the surface, the temperature is 5° C which would allow these organisms to thrive.

According to this, the answer is that the prediction that is most likely based on the data is that organisms that require a temperature at 5°C will thrive -0.6 km below the surface.