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What is the primary role of phytoplankton in marine ecosystems?

They act as primary producers, forming the base of the marine food web.They are decomposers that break down organic material.They are apex predators that control fish populations.They provide shelter for larger marine animals.

Which of the following groups of organisms rely directly on phytoplankton for food?

Carnivorous fishFilter-feeding zooplanktonDolphinsMarine mammals

What effect do phytoplankton blooms have on marine ecosystems?

They can lead to increased oxygen levels and support marine life.They always result in harmful effects on marine organisms.They prevent the growth of coral reefs.They deplete nutrients in the ocean permanently.

Assessment

What is the primary role of phytoplankton in marine ecosystems?

Which of the following groups of organisms rely directly on phytoplankton for food?

What effect do phytoplankton blooms have on marine ecosystems?