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Astudent observes a star from two positions of earth in its orbit, in summer and winter, and measures the change in the position of the star. which of these can be best calculated by this method?
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When does the circulatory system work with the respiratory system? a. during blood cell formation b. during cellular respiration c. during intestinal digestion d. during a viral infection
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Biology, 22.06.2019 04:00
Awave has a wavelength of 15 mm and a frequency of 6 hertz. what is its speed?
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What was the amount of oxygen in earths early atmosphere...
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