Agriculture
Making the most of a meal
Watching out for vultures
Growing Healthier Tomato Plants
Amphibians
Toads
Bullfrogs
Newts
Animals
Blotchy Face, Big-Time Wasp
No Fair: Monkey Sees, Doesn't
Not Slippery When Wet
Behavior
Two monkeys see a more colorful world
Chimpanzee Hunting Tools
A Light Delay
Birds
Emus
Finches
Woodpecker
Chemistry and Materials
Mother-of-Pearl on Ice
Gooey Secrets of Mussel Power
Pencil Thin
Computers
Look into My Eyes
The solar system's biggest junkyard
Computers with Attitude
Dinosaurs and Fossils
The bug that may have killed a dinosaur
From Mammoth to Modern Elephant
Ferocious Growth Spurts
E Learning Jamaica
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Results of GSAT are in schools this week
2014 GSAT Results for Jamaican Kids
Earth
Arctic Algae Show Climate Change
Less Mixing Can Affect Lake's Ecosystem
Greener Diet
Environment
Pollution Detective
Hazy with a Chance of Sunshine
Flu river
Finding the Past
Writing on eggshells
Digging Up Stone Age Art
Of Lice and Old Clothes
Fish
A Jellyfish's Blurry View
A Grim Future for Some Killer Whales
Catfish
Food and Nutrition
The mercury in that tuna
The Color of Health
Healing Honey
GSAT English Rules
Subject and Verb Agreement
Capitalization Rules
Problems with Prepositions
GSAT Exam Preparation Jamaica
Results of GSAT are in schools this week
Scotiabank Jamaica Foundation Grade Six Achievement Test (GSAT) Scholarships
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
GSAT Exams Jamaica Scholarships
Access denied - Disabled boy aces GSAT
GSAT stars reap scholarship glory
2014 GSAT Results for Jamaican Kids
GSAT Mathematics
Math of the World
Prime Time for Cicadas
A Sweet Advance in Candy Packing
Human Body
Tapeworms and Drug Delivery
Spit Power
Gut Microbes and Weight
Invertebrates
Giant Clam
Butterflies
Clams
Mammals
Jaguars
Cows
Primates
Parents
Raise a Lifelong Reader by Reading Aloud
Choosing a Preschool: What to Consider
How children learn
Physics
Thinner Air, Less Splatter
Project Music
Electric Backpack
Plants
Pumping Up Poison Ivy
City Trees Beat Country Trees
Seeds of the Future
Reptiles
Komodo Dragons
Black Mamba
Turtles
Space and Astronomy
Planets on the Edge
A Dusty Birthplace
A Darker, Warmer Red Planet
Technology and Engineering
Toy Challenge
Machine Copy
Smart Windows
The Parts of Speech
Pronouns
What is a Preposition?
What is a Noun
Transportation
Troubles with Hubble
How to Fly Like a Bat
Revving Up Green Machines
Weather
Recipe for a Hurricane
The Best Defense Is a Good Snow Fence
Antarctica warms, which threatens penguins
Add your Article

Clone Wars

Sea anemones look like peaceful creatures. The squishy animals cling to rocks and wave their tentacles around. They grab whatever food comes along as the watery world passes by. Anemones, however, aren't as mellow as they might seem. Researchers have observed armies of anemones attacking each other in raging wars. "Sea anemone fights are amazing," says David Ayre of the University of Wollongong in Australia. Some 50 years ago, scientists noticed that certain anemones have special tentacles that aren't used for capturing food. Called acrorhagi, these tentacles are used instead as weapons to sting enemy anemones. Certain individuals, called warriors, have lots of acrorhagi. Some kinds of sea anemones live pretty much by themselves but a common kind, Anthopleura elegantissima, on the west coast of the United States sticks together in dense groups. Each member of a group has exactly the same DNA as every other member of the group, making them genetic clones of each other. Researchers wanted to learn more about how anemones fight, but A. elegantissima are hard to study in the wild. So, the scientists toiled to move a big boulder with two groups of anemone clones into their lab. They had an aquarium built around it. The aquarium was regularly filled with water, and then emptied again to copy the action of tides. When water rushed in after low tide in the aquarium, the researchers were surprised to find, warrior anemones near the border between the groups puffed up their acrorhagi, made their bodies three times longer than they were before, and started twisting around. They were able to reach out and sting foreign individuals that had crept too close. The surprises didn't stop there. Anemone patches grow close to each other but usually leave an empty strip between them. Small anemones in the first row sometimes creep into this strip, ending up very close to the other patch. One little critter that had crept into the empty zone, nicknamed Stumpy, endured such a strong attack that its own colony rejected it when it returned home. The researchers suggest that the attack covered Stumpy with so many foreign stinging cells that its own clones didn't recognize it. Perhaps, they say, small anemones like Stumpy work as scouts in battle. It's a tough world out there—even for creatures that look as if they have a mellow lifestyle.—E. Sohn

Clone Wars
Clone Wars








Designed and Powered by HBJamaica.com™