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Upon fertilization, a zygote forms and develops into an embryo. This tutorial elaborates on the growth and development f..

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A running water environment offers numerous microhabitats for many types of animals. Similar to plants, animals in lotic..

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This tutorial looks at sex determination via the sex chromosomes, X and Y. Read it to get more info on X and Y chromosom..

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New Zealand is known for its unique biodiversity, caused by its remarkable geography and geologic history. Breaking away..

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Illusions are the perceptions and sensory data obtained from situations in which human error prevents us from seeing the..

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Certain species are capable of expressing characteristics indicative of the state of the ecosystem they occupy. They are..