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Watering the Air
Chicken Eggs as Drug Factories
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New Monkey Business
Lucky Survival for Black Cats
Moss Echoes of Hunting
Behavior
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Fear Matters
Memory by Hypnosis
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Macaws
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Birds We Eat
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Nanomagnets Corral Oil
Bang, Sparkle, Burst, and Boom
Sticking Around with Gecko Tape
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The solar system's biggest junkyard
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Look into My Eyes
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Meet the new dinos
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Three strikes wiped out woolly mammoths
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Results of GSAT are in schools this week
2014 GSAT Results for Jamaican Kids
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Sky Dust Keeps Falling on Your Head
Science loses out when ice caps melt
Riding to Earth's Core
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Snow Traps
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Will Climate Change Depose Monarchs?
Finding the Past
Chicken of the Sea
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Your inner Neandertal
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The Essence of Celery
In Search of the Perfect French Fry
The mercury in that tuna
GSAT English Rules
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Results of GSAT are in schools this week
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GSAT Mathematics
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How a Venus Flytrap Snaps Shut
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A Sour Taste in Your Mouth
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What Not to Say to Emerging Readers
The Surprising Meaning and Benefits of Nursery Rhymes
Raise a Lifelong Reader by Reading Aloud
Physics
Gaining a Swift Lift
Road Bumps
The Mirror Universe of Antimatter
Plants
Tracking the Sun Improves Plant Pollen
Farms sprout in cities
A Giant Flower's New Family
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Gila Monsters
Space and Astronomy
Ringing Saturn
A Dusty Birthplace
Saturn's Spongy Moon
Technology and Engineering
A Light Delay
Musclebots Take Some Steps
Sugar Power for Cell Phones
The Parts of Speech
What is a Verb?
Pronouns
Countable and Uncountable Nouns
Transportation
Charged cars that would charge
Ready, unplug, drive
Are Propellers Fin-ished?
Weather
Antarctica warms, which threatens penguins
A Dire Shortage of Water
Weekend Weather Really Is Different
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Aquatic Animals

A marine mammal is a mammal that is primarily ocean-dwelling or depends on the ocean for its food. Mammals originally evolved on land, but later marine mammals evolved to live back in the ocean. There are five groups of marine mammals: 1. Order Sirenia: the manatee, dugong, and sea cow 2. Order Carnivora, family Ursidae: the polar bear 3. Order Carnivora, infrafamily Pinnipedia: the seal, sea lion, and walrus 4. Order Carnivora, family Mustelidae: the Sea Otter and Marine Otter 5. Order Cetacea: the whale, dolphin, and porpoise Since different groups of marine mammals originate from different ancestors, this is a case of convergent evolution. Since mammals originally evolved on land, their spines are optimized for running, allowing for up-and-down but only little sideways motion. Therefore, marine mammals typically swim by moving their spine up and down. By contrast, fish normally swim by moving their spine sideways. For this reason, fish mostly have vertical caudal (tail) fins, while marine mammals have horizontal caudal fins. Some of the primary differences between marine mammals and other marine life are: Marine mammals breathe air, while most other marine animals extract oxygen from water. Marine mammals have hair. Cetaceans have little or no hair, usually a very few bristles retained around the head or mouth. All members of the Carnivora have a coat of fur or hair, but it is far thicker and more important for thermoregulation in Sea Otters and Polar Bears than in seals or sea lions. Thick layers of fur contribute to drag while swimming, and slow down a swimming mammal, giving it a disadvantage in speed. Marine mammals have thick layers of blubber used to insulate their bodies and prevent heat loss. Sea Otters and Polar Bears are exceptions, relying more on fur and behavior to stave off hypothermia. Marine mammals give live birth. Most marine mammals only give birth to one calf or pup at a time, and are never able to birth twins or larger litters. Marine mammals feed off milk as young. Maternal care is extremely important to the survival of offspring that need to develop a thick insulating layer of blubber. The milk from the mammary glands of marine mammals often exceeds 40-50% fat content to support the development of blubber in the young. Marine mammals maintain a high internal body temperature. Unlike most other marine life, marine mammals carefully maintain a core temperature much higher than their environment. Blubber, thick coats of fur, blubbles of air between skin and water, countercurrent exchange, and behaviors such as hauling out, are all adaptations that aid marine mammals in retention of body heat. The polar bear spends a large proportion of its time in a marine environment, albeit a frozen one. When it does swim in the open sea it is extremely proficient and has been shown to cover 74 km in a day. For these reasons, some scientists regard it as a marine mammal.

Aquatic Animals
Aquatic Animals








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