What is the largest ecosystem on Earth?
Grassland
Ocean
Desert
Forest
What is the primary producer in ocean ecosystems?
Phytoplankton
Coral
Crabs
Fish
Which ocean zone receives the most sunlight?
Bathyal zone
Abyssal zone
Hadal zone
Epipelagic zone
Coral reefs are found mostly in which type of water?
Freshwater rivers
Warm, shallow water
Cold, deep water
Polar ice caps
What role do zooplankton play in the ocean food chain?
Decomposers
Primary consumers
Producers
Top predators
Which of these is a keystone species in many ocean ecosystems?
Sharks
Sponge
Sea otter
Seaweed
What is ocean acidification primarily caused by?
Overfishing
Plastic pollution
Oil spills
Carbon dioxide absorption
Which of the following organisms is a decomposer in marine ecosystems?
Dolphins
Jellyfish
Bacteria
Tuna
What is the term for the bottom of the ocean?
Seabed
Littoral
Pelagic
Benthic
Which of these is NOT a threat to ocean ecosystems?
Climate change
Overfishing
Oil spills
Natural fluctuations in ocean current
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