Light can behave as a particle or as a wave
a. True
b. False
Indicate whether the statement is true or false
True
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What kind of galaxies are the largest galaxies in our Universe?
A.) Spiral. B.) Irregular. C.) Elliptical.
For a system in mechanical equilibrium, the resultant
A) force must be zero. B) torque must be zero. C) both of these D) none of these
What other recent hypotheses would corroborate the hypothesis that life on Earth originated in space? (Choose all that apply.)
A) amino acids forming DNA B) meteorites containing amino acids C) cometary impacts as the source of water on Earth D) early aerobic organisms created the oxygen in Earth's atmosphere E) the fossil record showing how biological organisms on Earth have changed over time
Which planet has a greenhouse effect?
A. Mercury B. Mars C. Venus D. Earth E. Venus, Earth, and Mars