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Lentic or still water communities can vary greatly in appearance -- from a small temporary puddle to a large lake. The s..

Chemical composition of the body
Chemical Composition of the Body

The body is comprised of different elements with hydrogen, oxygen, carbon, and nitrogen as the major four. This tutorial..

Photosynthesis and respiration
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Plants are responsible for incredible feats of molecular transformation. Plant processes, such as photosynthesis, photop..

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Hormones are chemical messengers produced by specialized glands and they were produced by switching on the genes designe..

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Birth of a Human Baby

Following nine months inside the mother's womb is the birth of the baby. Know the different stages of the birthing proce..