World Book Trivia Challenge--11/5-under The Sea

Explanation
Electric eels can produce a discharge of up to 650 volts. This discharge can kill a fish or stun a human being, though electric eels rarely harm people.

Explanation
The great barracuda, found in the Atlantic, Indian, and western Pacific oceans, is the largest species of barracuda. It can grow to about 6 feet (1.8 meters) and 100 pounds (45 kilograms). The great barracuda is called the "tiger of the sea" because it is swift and destructive.

Explanation
Fish breathe by means of gills, which absorb dissolved oxygen from water. Whales have lungs and must come to the surface to breathe. But they can hold their breath for long periods.

Explanation
Coral reefs grow only in water with enough light for photosynthesis to occur in the algae. Photosynthesis is the process in which an organism converts energy from sunlight into food.

Explanation
Scientists classify the walrus as a kind of large seal. The walrus is the only seal with tusks.

Explanation
A shrimp’s stiff shell entirely encloses its body. It is made of a substance called chitin.

Explanation
Adult sponges do not move about from one place to another, and many sponges look like plants. For these reasons, people once regarded sponges as plants. But today, scientists classify sponges as animals. Like most animals, sponges eat their food. They cannot manufacture their own food, as do plants.

Explanation
An octopus can escape danger by rapidly changing colors. These color changes may startle a predator or enable the octopus to blend with its surroundings. Octopuses also may use color changes to communicate with one another and as a courtship display.

Explanation
Some jellyfish can inflict painful and dangerous stings to people. Jellyfish called sea wasps or box jellyfish inject a poison deadlier than any snake venom. Some people have died within three minutes of being stung by a sea wasp. Sea wasps live in the waters of Australia and Oceania.

Explanation
Earless seals are different from fur seals and sea lions. These seals do not have ear flaps, but they do have ears. In fact, they have excellent hearing both above and below the water.