According to current science, why didn't oxygen begin to accumulate in the atmosphere for more than a billion years after life appeared on the Earth?
A) Oxygen was removed from the atmosphere by chemical reactions with surface rocks as quickly as it was released by life.
B) Early forms of animal life consumed the oxygen released by plants during the first billion years of life on Earth.
C) Early life did not release oxygen, and oxygen releasing organisms didn't evolve for a billion years after the earliest life.
D) Oxygen was removed from the atmosphere by dissolving in the ocean as quickly as it was released by life.
A) Oxygen was removed from the atmosphere by chemical reactions with surface rocks as quickly as it was released by life.
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An "onion skin" shell burning structure develops in:
A. a star much less massive than the Sun. B. a white dwarf. C. a star like the Sun. D. a neutron star. E. a star much more massive than the Sun.
Which of the following are the jovian planets?
A. Jupiter, Saturn, Uranus, Neptune B. Mercury, Jupiter, and Saturn C. Uranus, Neptune, and Pluto D. Mercury, Venus, Earth, Mars E. Earth, Mars, Jupiter, Saturn
Heisenberg's uncertainty principle is
A) noticeable only for submicroscopic particles. B) a fundamental principle in quantum mechanics. C) predominant in the atomic domain. D) all of the above E) none of the above
How many grams of ethanol (density 0.80 g/cm3 ) should be added to 5.0 g of chloroform (density 1.5 g/cm3 ) if the resulting mixture is to have a density of 1.2 g/cm3?
Assume that the fluids do not change their volumes when they are mixed. A) 2.0 g B) 2.4 g C) 1.8 g D) 4.4 g E) 1.6 g