By: Jonte Rhodes
The common house spider (Parasteatoda tepidariorum) is probably the most common spider in the world, and due to its love of hiding in human dwellings, is the most encountered by people as well. Although many millions of people are scared of house spiders, they are...
Arachnids: Camel spiders
By: Jonte Rhodes
The camel spider has achieved a degree of notoriety in recent times due to several pictures of it making their way into the national press. However in actual fact this misunderstood arachnid is not even a spider at all, and in most ways is fairly...
Introduction to the characteristics of the Metazoa
By: M E Skeel
Metazoa are multicelled animals with three layers of cells. Why multicelled animals evolved is succinctly stated by Meglitsch (1972, p 78): "The highly plastic and successful protozoan organisational plan imposed but one serious limitation - that of size. An undivided mass of protoplasm becomes physiologically...
Is evolution an outdated theory?
By: Paul Peters - 483623
What are you talking about Willis. Is evolution an outdated theory? Of course it's not. Sure the theory is still very controversial topic, but does that make it automatically "outdated". As a matter of fact, this theory is actually the exact opposite. I believe that...
The significance of sponges in marine ecosystems
By: M E Skeel
Sponges are as un-animal-like as animals can be. They don't move around or make noises. They don't have sense organs or heads or brains. They were thought to be plants until 1825 when they were finally racognised to be simple multicelled animals. They are also...
By: Jonte Rhodes
Black widow spiders are one of the most feared and dangerous species in the world, for the simple fact that they have a potent and toxic venom and that they are often found in the same areas that people inhabit. But past the fact that...
Insights into the lives of rotifers
By: M E Skeel
Rotifers are pretty animals, transparent with one or two red eye spots and dancing about on two toes like ballerinas, with a crown of cilia that twirl as they dance. Don't be fooled though, as they are actually fierce little predators, much feared in their...
How do bull sharks live in fresh water
By: Jason Hernandez
The problems faced by a fish in freshwater are the opposite of those faced in saltwater. The physiological strategies fish use to deal with both these problems are called osmoregulation. This is the clue to how it works - "osmo-" refers to osmosis, the absorption...
Information about horsehair worms (Phylum Nematomorpha)
By: M E Skeel
Horsehair worms are generally seen writhing around and tying themselves up in knots in puddles of water after a rain. Occasionally one will find a spider or insect with a big, nasty-looking worm hanging out of it - this too is a horsehair worm. But...
Information about Entoprocts
By: M E Skeel
Entoprocts are small marine or aquatic creatures that superficially resemble little sea anenomes or hydroids, with a crown of tentacles, and a short vase-shaped body with a stalk that holds the animal to its substrate. They are usually found in colonies. Closer examination reveals that...

 

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