Agriculture
New Gene Fights Potato Blight
Watching out for vultures
Silk’s superpowers
Amphibians
Tree Frogs
Toads
Frogs and Toads
Animals
Poor Devils
Sleep Affects a Bird's Singing
How to Fly Like a Bat
Behavior
Memory by Hypnosis
Making light of sleep
The case of the headless ant
Birds
Kiwis
Chicken
Lovebirds
Chemistry and Materials
Sticky Silky Feet
A Framework for Growing Bone
Cold, colder and coldest ice
Computers
A Light Delay
Hitting the redo button on evolution
Fingerprint Evidence
Dinosaurs and Fossils
Three strikes wiped out woolly mammoths
A Really Big (but Extinct) Rodent
Big Fish in Ancient Waters
E Learning Jamaica
Results of GSAT are in schools this week
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
2014 GSAT Results for Jamaican Kids
Earth
Easy Ways to Conserve Water
Riding to Earth's Core
Quick Quake Alerts
Environment
Whale Watch
The Wolf and the Cow
Easy Ways to Conserve Water
Finding the Past
Sahara Cemetery
A Long Haul
Words of the Distant Past
Fish
Skates and Rays
Perches
Parrotfish
Food and Nutrition
A Pepper Part that Burns Fat
Moving Good Fats from Fish to Mice
Eat Out, Eat Smart
GSAT English Rules
Subject and Verb Agreement
Adjectives and Adverbs
Pronouns
GSAT Exam Preparation Jamaica
Preparing for the GSAT Exam
2014 GSAT Results for Jamaican Kids
The Annual GSAT Scholarships
GSAT Exams Jamaica Scholarships
GSAT stars reap scholarship glory
Access denied - Disabled boy aces GSAT
2014 GSAT Results for Jamaican Kids
GSAT Mathematics
How to Slice a Cake Fairly
Secrets of an Ancient Computer
Prime Time for Cicadas
Human Body
Music in the Brain
Walking to Exercise the Brain
From Stem Cell to Any Cell
Invertebrates
Bedbugs
Millipedes
Scorpions
Mammals
Mongooses
Oxen
Primates
Parents
What Not to Say to Emerging Readers
Children and Media
The Surprising Meaning and Benefits of Nursery Rhymes
Physics
Spin, Splat, and Scramble
Powering Ball Lightning
Einstein's Skateboard
Plants
City Trees Beat Country Trees
Pumping Up Poison Ivy
Stalking Plants by Scent
Reptiles
Lizards
Turtles
Crocodiles
Space and Astronomy
Dark Galaxy
Sun Flips Out to Flip-Flop
Mercury's magnetic twisters
Technology and Engineering
Shape Shifting
Supersuits for Superheroes
Searching for Alien Life
The Parts of Speech
What is a Verb?
What is a Noun
Adjectives and Adverbs
Transportation
Ready, unplug, drive
Tinkering With the Basic Bike
Reach for the Sky
Weather
A Change in Climate
In Antarctica watch the heat (and your step)
Recipe for a Hurricane
Add your Article

Mollusks

Although mollusks are probably best known for their unique shells, the word itself actually comes from he Latin word for "soft." Beneath their shells, mollusks are actually very soft-bodied invertebrates (no spine) -- and some of the most well-known mollusks (like the octopus, for example) have no shells at all. Mollusks share a mantle (a fold of skin that lines the shell, when present) and a muscular foot that they use for motion. Many types of mollusks are raised and captured for food -- squid and clams, for example -- and some people consider eating snails a true delicacy. The mollusks are members of the large and diverse phylum Mollusca, which includes a variety of familiar creatures well-known for their decorative shells or as seafood. These range from tiny snails, clams, and abalone to the octopus, cuttlefish and squid (which are considered the most intelligent invertebrates). There are some 70,000 described species within this phylum. The giant squid, which until recently had not been observed alive in its adult form, is the largest invertebrate; although it is likely that the Colossal Squid is even larger. The scientific study of mollusks is called malacology. The mollusk's body is often divided into a head, with eyes or tentacles, a muscular foot and a visceral mass housing the organs. Mollusks have a mantle, which is a fold of the outer skin lining the shell, and a muscular foot that is used for motion. Many mollusks have their mantle produce a calcium carbonate external shell and their gill extracts oxygen from the water and disposes waste. All species have a complete digestive tract that starts from the mouth to the anus. Many have a feeding structure, the radula, mostly composed of chitin. Radulae are diverse within the Mollusca, ranging from structures used to scrape algae off rocks, to the harpoon-like structures of cone snails. Cephalopods (squid, octopuses, cuttlefish) also possess a chitinous beak. Unlike the closely related annelids, mollusks lack body segmentation. Development passes through one or two trochophore stages, one of which (the veliger) is unique to the group. These suggest a close relationship between the mollusks and various other protostomes, notably the Annelids. Mollusk fossils are some of the best known and are found from the Cambrian onwards.

Mollusks
Mollusks








Designed and Powered by HBJamaica.com™