How do scientists study the history of life on Earth?
A) by studying fossils of ancient life only
B) by comparing DNA among living organisms only
C) both by studying fossils of ancient life and by using telescopes to study habitable worlds elsewhere
D) both by studying fossils of ancient life and comparing DNA among living organisms
E) by using telescopes to study habitable worlds elsewhere only
D) both by studying fossils of ancient life and comparing DNA among living organisms
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Photon Momentum: If the wavelength of a photon is the same as the de Broglie wavelength of an electron, which one has the greater momentum?
A. The electron because it has more mass. B. The photon because it is traveling faster. C. They both have the same momentum.
In a superconductor, the electrical conductivity is infinite below the _________temperature.
Fill in the blank(s) with the appropriate word(s).
In comparing the Terrestrial planets, which planet is most similar in size to Earth?
a. Mercury b. Venus c. Mars d. the Moon e. Neptune
If you live in Florida and your aunt lives in Seattle and both of you have a clear night then you both will see the same phase of the Moon that night
a. True b. False Indicate whether the statement is true or false