Interesting Facts About Ocean and Marine Life

The ocean produces at least 50% of the Earth's oxygen through phytoplankton photosynthesis.

Octopuses have three hearts: two pump blood to the gills, while a third pumps it to the rest of the body.

Some species of sharks can detect a single drop of blood in an Olympic-sized swimming pool.

The blue whale, the largest animal on Earth, can weigh as much as 33 elephants and is as long as a basketball court.

Sea turtles have been around for over 110 million years, even surviving the event that wiped out the dinosaurs.

Starfish can regenerate lost arms, and in some cases, an entire body can grow from a single arm.

The deepest part of the ocean, the Mariana Trench, is so deep that if Mount Everest were placed inside it, the peak would still be underwater.

Jellyfish have neither brains nor hearts, yet they have existed for over 600 million years.

Dolphins use echolocation to hunt and navigate, allowing them to 'see' with sound waves.