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"Hello everyone, I’m Rahul P Menon from the Department of Robotics and Automation. Today, we’re diving deep into the structure and functions of oceanic ecosystems — the complex web of life beneath our planet’s waters. Our oceans cover over seventy percent of Earth’s surface and hold ninety-seven percent of all water. They regulate climate, absorb massive amounts of carbon dioxide, and support the lives of nearly three billion people worldwide. The ocean is divided into distinct zones. The Sunlight Zone, where most life thrives and photosynthesis happens. The Twilight Zone, dimly lit, home to bioluminescent creatures. The Midnight Zone, a place of complete darkness where life survives on marine snow and chemosynthesis. And the Abyssal Zone — freezing, high-pressure plains where only the most specialized creatures can live. At the base of the food chain are the primary producers. Tiny phytoplankton produce seventy percent of Earth’s oxygen. Seaweeds and kelp create underwater forests, while seagrass meadows store carbon and protect our coasts. From there, energy moves up the food web — to zooplankton, small fish, then to larger predators like tuna, sharks, and dolphins. But only ten percent of energy transfers at each level, which is why the ocean’s foundation is so important. The deep sea is a world of extremes — near-freezing temperatures, crushing pressure, and glowing creatures. Around hydrothermal vents, bacteria use chemicals, not sunlight, to create life. Coral reefs are like underwater rainforests. They cover less than one percent of the ocean but support a quarter of all marine life. Half a billion people depend on them for food and income. But human impact is taking a toll. Eight million tonnes of plastic enter our oceans every year. Ninety percent of large fish stocks are gone compared to 1950. Rising carbon dioxide is acidifying the ocean and bleaching coral reefs. The good news? We can still make a difference. Marine protected areas allow ecosystems to recover. Sustainable fishing and plastic reduction programs can help restore balance. And global cooperation is essential to protect the blue heart of our planet. The ocean connects all life on Earth. Its health is our future — and protecting it is no longer a choice, it’s a responsibility."