Science & Technology
Fish

A fish is a water-dwelling vertebrate with gills that doesn't change form, as amphibians do, during its life. There are over 29,000 species of fish, making them the most diverse group of vertebrates.
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, with no Front-Cover Texts, and with no Back-Cover Texts.
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Fish eBook
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Fish for HTML
- Fish for PHP-Nuke, PHP-Nuke Platinium and PCN Max
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Fish for PostNuke
- Fish for Xoops, eXoops, E-Xoops and Runcms
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Fish for Mambo and Joomla
Reptiles

Reptiles are tetrapods and amniotes, animals whose embryos are surrounded by an amniotic membrane. Today there are 6,800 reptile species on earth; the major groups are alligators and crocodiles, turtles, lizards, and snakes.
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, with no Front-Cover Texts, and with no Back-Cover Texts.
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Reptiles eBook
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Reptiles for HTML
- Reptiles for PHP-Nuke, PHP-Nuke Platinium and PCN Max
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Reptiles for PostNuke
- Reptiles for Xoops, eXoops, E-Xoops and Runcms
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Reptiles for Mambo and Joomla
Birds

Birds are bipedal, warm-blooded, oviparous vertebrate animals characterized primarily by feathers, forelimbs modified as wings, and (in most) hollow bones.
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, with no Front-Cover Texts, and with no Back-Cover Texts.
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Birds eBook
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Birds for HTML
- Birds for PHP-Nuke, PHP-Nuke Platinium and PCN Max
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Birds for CPG-Nuke
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Birds for PostNuke
- Birds for Xoops, eXoops, E-Xoops and Runcms
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Birds for Mambo and Joomla
Physics Help

Physics is the science of Nature in the broadest sense. Physicists study the behaviour and interactions of matter and radiation. Theories of physics are generally expressed as mathematical relations.
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, with no Front-Cover Texts, and with no Back-Cover Texts.
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Physics Help eBook
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Physics Help for HTML
- Physics Help for PHP-Nuke, PHP-Nuke Platinium and PCN Max
