What was detected on Halley's Comet and observed on Hale-Bopp that imply the possibility of life on Earth originating in space?
A) DNA
B) amino acids
C) organic material
D) nucleotide bases
E) ammonia
C
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What is the relative humidity of air when it is at its dew point?
What will be an ideal response?
Which is the smallest?
A) The distance from the Sun to the Andromeda Galaxy B) The distance from the Sun to the Virgo cluster of galaxies C) The distance from the Sun to the center of the Milky Way Galaxy D) The Solar System. E) The distance from the Sun to its nearest neighboring sta
A particle with a charge of 4.0 ?C has a mass of 5.0 × 10-3 kg. What electric field directed upward will exactly balance the weight of the particle?
A) 4.1 × 102 N/C B) 8.2 × 102 N/C C) 4.4 × 104 N/C D) 1.2 × 104 N/C E) 5.1 × 106 N/C
The ideal shape for the primary mirror of a telescope is
a. concave circular. b. convex circular. c. concave parabolic. d. convex parabolic. e. plane.