Biotic Factors. At the bottom of a food web are producers, or autotrophs, which produce their own food through
Humans took seeds from wild plants and grew them close to their homes, and the very early farmers observed that some plants had more favorable characteristics than others, such as better-tasting or more numerous or retained seeds, or were easier to grow, or were more vigorous.
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Plate tectonics is a scientific theory describing the large-scale motion of the plates making up the Earth's lithosphere since tectonic processes began on Earth between 3.3 and 3.5 billion years ago. The model builds on the concept of continental drift, an idea developed during the first decades of the 20th century.
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