Why fish have gills
By: Bob Lloyd
All animals respire which means that they use oxygen in the process of extracting energy from their foodstuffs, and produce carbon dioxide as a waste product.Mammals have lungs which provide a huge surface area for air to come into contact with blood so that...
The importance of a shell for crustaceans and mollusks
By: Judith Willson
Crustaceans and molluscs (or mollusks) are both considered invertebrates yet are no more closely related to each other than they are to us. What they have in common, though, are hard outer coverings. You will have seen the shells of crabs and snails if you...
By: Brandon Romines
Dolphins are commonly believed to be the second most intelligent animal, with only humans surpassing them. Some people may still argue that chimpanzees, bonobos or another great ape should hold that position, research suggests they lag behind dolphins. The brain to body size ratio seems...
The brains of starfish
By: Judith Willson
Starfish are marine invertebrates common throughout the world’s oceans. There are nearly 2,000 known species and no doubt, as with practically all forms of marine life ( in particular the smaller ones), there are almost certainly many others as yet undocumented. They range...
By: JC Campbell
The great white shark has been made famous in part thanks to the hit movie Jaws, created by director Steven Spielberg. It has gained the reputation as a result for being a man-eating killer. As the largest carnivorous fish in the world, the great white...
The differences between zooplankton and phytoplankton
By: James Johnson
Plankton, it is defined by Webster's Dictionary as "the usually microscopic animal and plant life found floating or drifting in the ocean or in bodies of fresh water, used as food by nearly all aquatic animals". Why does it say "usually microscopic"? Because plankton is...
Facts about copepods
By: M E Skeel
Copepods are arthropods (Phylum Arthropoda) because they have jointed legs and exoskeletons. The Phylum Arthropoda is divided into three large groups: terrestrial mandibulates (insects), terrestrial chelicerates (spiders) and aquatic mandibulates, the Crustaceans. Copepods are crustaceans because they are aquatic and have mandibles. What are mandibles...
By: Tim Harry
On the face of it the Goblin Shark, Mitsukurina owstoni, would appear to have little impact upon the environment. It is one of the least seen and least studied of all of the world’s 440 shark species, and thus if it wasn’t there...
Truth and myths about the snakehead fish
By: Peter Stern
The snakehead fish is one of the most prolific and ferocious fresh water predators on earth. The head resembles a snake’s head and the body is thin, long and muscular with snake-like patterns on either side. The origin of the snakehead is located in...
Why some fish have scales
By: Lea Miller
Everyone knows that some fish have scales. But why? What purpose do the scales serve for the fish? Most scientists believe the primary purpose of scales is to give the fish external protection. Scales come in several types and many sizes. The most common type...

 

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