Life in the Ocean: The Basics of Marine Biology

Life in the ocean is as diverse as it is mysterious. From coral reefs bustling with fish to the pitch-black depths where alien-like creatures thrive, every marine species has a role to play. How do they survive? Who eats who? And what strange, glowing organisms lurk in the deep?

Ocean turtle coming up for air.
Clown fish in anemone
What Is Marine Life?


Discover the diversity of marine life—from plants and animals to microbes—and learn how each plays a role in the ocean’s vast ecosystem.

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Seal underwater
How Do Ocean Creatures Survive in Different Environments?

Explore how marine life survives in extreme ocean environments—from glowing in the dark to withstanding crushing pressure and freezing temperatures.

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Great white shark with mouth open
Food Webs: Who Eats Who in the Ocean?

Explore who eats whom in the ocean! Learn how marine food webs connect plankton to predators and why these links are vital for ocean health and balance.

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Bioluminescence blue jellyfish_lesson 4
The Weird and Wonderful: Bioluminescence, Deep-Sea Giants, and Extremophiles

Meet the ocean's weirdest creatures—from glowing predators to deep-sea giants and extremophiles that thrive in boiling vents and freezing darkness.

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ROV (Remotely Operated Vehicle) Exploring the Deep_Lesson 5
How Do We Discover New Marine Species?

From deep-sea dives to DNA analysis, discover how scientists explore the unknown and uncover new marine species in Earth’s last true frontier: the ocean.

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Where to next?

Keep exploring marine science or discover more ways to be part of the wave.

Aerial view of a whale and her calm swimming along one another.