How can you distinguish between high chlorophyll concentration in the ocean and high chlorophyll concentration on land?

In a satellite image, Places of high chlorophyll concentration in the ocean appear dark green in color while places of high chlorophyll concentration on land appears dark grey in color

Explanation:

When we do an evaluation of GIS image for chlorophyll, places in sea where the chlorophyll concentrations  is very high appears dark green in color in the satellite image while the places where chlorophyll concentration is low appears blue in color.

However on land, when the chlorophyll concentration is high i.e the number of plants are high in number on land , then such places appear dark gray in color while the places of low chlorophyll concentration appear light gray in color

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your answer should be c) enjoy!