Environment, genetics, selective breeding, random mating, random fertilization, recombination, crossing over, etc
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If the temperature is increased then the radish germination is increased. Meaning that the radish will grow faster
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Some variation is the result of differences in the surroundings, or what an individual does. This is called environmental variation.
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The sneeze centre sends signals to the parts of your body that need to work together to help you sneeze. Your chest muscles, diaphragm, abdominals, vocal cords and the muscles in the back of your throat all work together to help you expel the irritant. Muscular, immune, nervous, respiratory.
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