Which of the following was an important source of prebiotic molecules (e.g., amino acids) on the early Earth?
A) molecules produced on the surface by impacts
B) molecules produced by chemical reactions near deep-sea ocean vents
C) molecules transported to the surface by impacts
D) all of these
D
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Determine the effective emissivity of a bank of air 80 cm thick at 20ºC, 80% relative humidity, and 1 atmosphere pressure.
What will be an ideal response?
____ is a mineral made of oxidized hydrogen
Fill in the blank(s) with the appropriate word(s).
A car starts from rest and after 10 seconds is traveling at 30 m/s. Assuming that it continues to accelerate at the same rate it will take another ________ seconds to reach 60 m/s.
Fill in the blank(s) with the appropriate word(s).
Evidence for the existence for Pangaea includes
a. biological evidence only. b. continuity of geologic features only. c. glacial evidence only. d. all of the above.