From outer space our planet looks like an awesome blue marble. That’s because more than 70 percent of Earth’s is covered by oceans. From the freezing polar regions to the warm waters of the tropics and deep sea hydrothermal vents to shallow seagrass beds, the oceans contain the greatest diversity of creatures on Earth.
Here are some marine animals whose names span the alphabet from A to Z. You have 20 minutes to name them all.