Multiple choice

Why is the open sea the largest contributor of NPP

  1. covers up so much of Earth's surface

  2. some upwellings bring nutrients from bottom to the surface

  3. largest biodiversity

  4. both a and b
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The open sea covers a vast majority of the Earth's surface, and while its productivity per unit area is low, its sheer size makes it a significant contributor to global net primary productivity (NPP). Upwellings also play a role in nutrient cycling.

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