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colleen colleen
wrote...
Valued Member
Posts: 17077
12 years ago
The oceans cover about 360 million km2 and have an average depth of about 4,000 m. What proportion of this aquatic system receives sufficient light to support photosynthesis? Make the liberal assumption that the photic zone extends to a depth of 200 m.
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wrote...
Staff Member
12 years ago
The proportion of the ecosystem receiving sufficient light to support photosynthesis is 200 m divided by 4000 m: 0.05 or 5% of the total.
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