All the iron on Earth originated from ______ .
Fill in the blank with the correct sentence.
nuclear fusion within the cores of intermediate, high, and very high-mass stars.
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Explain how the observed increases in carbon dioxide in the atmosphere could be a result of increased
temperature and not the other way around? What will be an ideal response?
Different insect species may not pollinate a plant because of the shape or color of its flowers. This is best described as ________
A) structural isolation B) disruptive isolation C) behavioral isolation D) reproductive isolation E) geographic isolation
South Africa
A) still practices apartheid despite efforts to end the practice. B) is completely landlocked. C) first elected a black president during the 1990s. D) signed the Law of the Sea despite concerns over ethnic segregation. E) has a large Italian minority population.
Which of the following small molecules are converted to form sugar in photosynthesis?
A. oxygen and water B. carbon dioxide and oxygen C. water and carbon dioxide D. hydroxyl ion and hydrogen