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Earth was created around 4.5 billion years ago and life began not long after. Primitive life likely possessed the elemen..
Life, as we know it today, is presumed to have started in the sea and many of them were likely eukaryotic animal-like or..
Hormones are produced in the endocrine glands of animals. The pituitary gland and hypothalamus are the most impor..
With regard to the population size of a species and what factors may affect them, two factors have been defined. They ar..
The water cycle (also referred to as the hydrological cycle) is a system of continuous transfer of water from the air, s..
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