The change in fossils at the K-T sediment layer suggests that in addition to the dinosaurs, _________ also went extinct.
Fill in the blank(s) with the appropriate word(s).
about three-quarters of all species living at the time
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Complete the following analogy: ____________::______________ as spin::orbit
Fill in the blank(s) with correct word
Why do we think the first generation of stars would be different from stars born today?
A) Without heavy elements, the clouds could not reach as low a temperature as today and had to be more massive to collapse. B) Without heavy elements, the nuclear reactions at the center of the stars would be very different. C) Without heavy elements, there was no dust in the clouds and they collapsed faster. D) The Universe was much denser when the first stars were born. E) There were no galaxies when the first stars were born.
The four plausible routes by which terrorists might use nuclear devices do not include
A) acquiring radioactive material and using conventional explosive to disperse this material. B) sabotaging a nuclear power plant. C) enriching natural uranium to weapons grade uranium, and building a nuclear weapon from it. D) obtaining weapons-grade uranium or plutonium and building a nuclear weapon from it. E) seizing an intact nuclear weapon.
Avogadro's number is related to the universal gas constant R and the number of moles n by:
a. NA = Rn b. NA = R/n c. NA = n/R d. Avogadro's number cannot be related to these two quantities alone.