From where do most of the nutrients in the Arctic come?

What is effective at forming a nutrient trap?

Which of the following marine ecosystem is the least productive?

What is the base of marine food webs?

What is the source of most ocean pollution?

Which of the following is NOT a marine ecosystem?

Which of the following is NOT a threat to coral reefs?

One way in which wetlands control flooding is by ---.

What adaptation prevents phytoplankton from sinking into deep waters?

What distinguishes nekton from benthos?

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