1 What is the world s largest marine mammal The world s largest marine mammal is the blue whale which can reach lengths of up to 100 feet and weigh as much as 200 tons 2 How do marine mammals stay warm in cold ocean waters Marine mammals such as seals and whales have a thick layer of blubber under their skin which acts as an insulating layer to keep them warm in cold waters 3 What is the Great Barrier Reef and where is it located The Great Barrier Reef is the world s largest coral reef system located in the Coral Sea off the coast of Queensland Australia It is renowned for its biodiversity and vibrant coral formations 4 How do marine animals like dolphins and whales breathe underwater Marine mammals have blowholes on the tops of their heads allowing them to surface and inhale air while expelling spent air and carbon dioxide 5 What is bioluminescence in marine organisms Bioluminescence is the ability of some marine organisms like certain species of jelly sh and sh to produce light through chemical reactions This adaptation serves various purposes including attracting prey or mates 6 What is the role of coral reefs in marine ecosystems Coral reefs are crucial for marine biodiversity providing habitats for countless species of sh and other marine life They also act as natural barriers protecting coastlines from erosion and storm damage 7 How do marine animals like sea turtles navigate across vast ocean distances Sea turtles use Earth s magnetic eld as well as cues from the sun and stars to navigate during their long migrations 8 What is over shing and how does it impact marine ecosystems Over shing is the excessive and unsustainable harvesting of sh and other marine species It disrupts marine food chains depletes sh populations and threatens the balance of marine ecosystems 9 What are some adaptations that deep sea creatures have developed to survive in extreme ocean depths Deep sea creatures have developed adaptations like bioluminescence pressure resistant bodies and special enzymes to cope with the low temperatures and high pressures of the deep ocean 10 How does ocean acidi cation affect marine life Ocean acidi cation caused by the absorption of excess atmospheric carbon dioxide by seawater can harm marine organisms with calcium carbonate shells and skeletons such as corals and some plankton species It disrupts their ability to build and maintain their protective structures ultimately impacting the entire marine food web