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This study guide tackles plant roots in greater detail. It delves into the development of plant roots, the root structur..

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Hormone Production

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

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Human Reproduction

Humans are capable of only one mode of reproduction, i.e. sexual reproduction. Haploid sex cells (gametes) are produced ..

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Running Water Freshwater Community Factors

This tutorial noted some of the physical and chemical factors that provide the framework of a running water community in..

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Lights’ Effect on Growth

This tutorial elaborates on the effect of light on plant growth. It describes how different plants require different amo..

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Insects

There are more species of insects than any other species combined. This surely illustrates that insects have the selecti..