Question

The oceans cover about 70 per cent of the Earth's surface and form the largest of the world's habitats. Lifeis found at all depths, from shallow surface waters to trenches over 7 miles (11 km) down.
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Answer 1

OCEANS. The oceans cover about 70 percent of the Earth's surface, and form the largest of the world's habitats. Life is found at all depths, from shallow surface waters to trenches over 7 miles (11 km) down.