Around the fall equinox and spring equinox the temperatures are more moderate because the Earth is at a position where it is neither in its closest, not furthest position from the Sun, the speed of the Earth slightly decreases as the spring equinox is nearing, so it starts to warm up, and slightly accelerates when the autumn equinox is nearing, so it starts to cool off. So to put it simple, these are the periods where the Earth is not in a position and speed where the Earth experiences extremes, but instead these are the transitional periods, so they are much more moderate than the extremes.
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If a pine seed finds the right micro-climate, it will eventually sprout and a pine seedling will start to grow. However, pine seeds are usually released in a dormant state, which is most often broken by cold stratification. As a result, a pine seed will not sprout until the following spring when warm weather and some spring moisture are present.
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Molecular Biology of the Cell is the classic in-depth text reference in cell biology. By extracting fundamental concepts and meaning from this enormous and ever-growing field, the authors tell the story of cell biology, and create a coherent framework through which non-expert readers may approach the subject. Written in clear and concise language, and illustrated with original drawings, the book is enjoyable to read, and provides a sense of the excitement of modern biology. Molecular Biology of the Cell not only sets forth the current understanding of cell biology (updated as of Fall 2001), but also explores the intriguing implications and possibilities of that which remains unknown.
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Answer: Humans have 22 pairs of autosomal chromosomes with the same gene in both members of a given pair) and one pair of sex chromosomes, which are designated XX in females and XY in males.
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