Biology
The habitat of African lions
By: William Mataba
The African Lion is essentially a plains animal, but moves into other areas when food or circumstances affect its needs. It is a large cat which cannot retract its claws, and left alone with nature, is dependent on the wandering grazing herds of antelope, gnus...
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By: Wendy R.
Louis Pasteur was a French microbiologist who was born in 1822 and died in 1895. He is credited with many breakthroughs in science which helped to prevent disease. His work and discoveries also helped to find the causes of many other diseases. Some of Louis...
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The breeding habits of the African lion
By: Michelle Graf
African Lions are the only species of big cats that voluntarily live in groups in the wild. As a result, their social structure has evolved to include specific mating rituals and rights. The pride is structured around the dominant male. His job is to protect...
By: N. David
As anyone who has seen a firefly knows, some living organisms are capable of producing and emitting light from within their own bodies. This is known as bioluminescence. Unlike many other common sources of light, bioluminescence creates light but does not generate very much heat...
By: M E Skeel
Butterflies and moths all have overlapping scales on their two pairs of wings and this is the meaning of their group name, Lepidoptera (lepido = scaley, pteron = wing). Under the scales, the wings are transparent and veined, as in other insects. Another common lepidopteran...
How an elephant uses its trunk
By: Srikanth Radhakrishna
The proboscis or trunk of an elephant is one of the wonders of nature! It is a fusion of nose and upper lip which is strong yet sensitive. Using its trunk, an elephant can pull down a tree and also pick up a blade of...
What is Xylem?
By: Sammy Stein
Xylem consists of long, dead cells and is part of the vascular tissue of a plant (the other components being phloem and cambium (cambium only in dicotyledons). Like our veins, xylem carries the life blood of a plant- water. Water enters the root hairs through...
By: M E Skeel
There are over a hundred thousand species of true flies in the world and as varied as they are, they all share an important characteristic: all have only two membranous wings. The second pair of wings have been altered into mini-gyroscopes called halteres that assist...
What is phloem?
By: Sammy Stein
Phloem is part of the vascular system in a plant. It carries food substances from the leaves, where they are manufactured, to all other parts of the plant. Phloem cells are long, living cells with sieve plates at either end. These sieve plates allow substances...
By: Erich Rosenberger M.D.
Scientists love to categorize the various types of lifeforms on Earth. One of the most basic categories are prokaryotes. This refers to the type of cell that makes up the organism. Most prokaryotes are single-celled organisms, although there are a few multi-cellular prokaryotic species. Prokaryotes...
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