How does the Sun's mass compare to Earth's mass?
A) The Sun's mass is about 300,000 times the mass of the Earth.
B) The Sun's mass is about 300 times the mass of the Earth.
C) The Sun's mass is about 30 times the mass of the Earth.
D) Both have approximately the same mass.
A) The Sun's mass is about 300,000 times the mass of the Earth.
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What is important about the habitable zone around a star that makes astronomers believe life could exist there?
a. The level of UV radiation from the star is minimal there. b. Only in the life zone can complex organic molecules be found. c. Planets in the life zone will always have oxygen atmospheres. d. In the life zone water can exist as a liquid.
An object is placed 15. cm from a concave mirror of focal length 20. cm. If the object is 4.0 cm tall,
(a) where is the image formed? (b) how tall is it?
A magnifying glass produces a virtual image
Indicate whether the statement is true or false
An amino acid is an organic molecule that contains both an amine group and a carboxyl group. At neutral pH, which structure is most likely:
A) structure (a) B) structure (b) C) neither structure D) both structures