In which eon of Earth's history did life originate?
A) Proterozoic
B) Phanerozoic
C) Archean
D) Hadean
A
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We can study how galaxies evolve because
A) we can watch as they interact in real time. B) the farther away we look, the further back in time we see. C) galaxies are transparent to visible light. D) we are really smart astronomers.
Most of the deuterium that formed right after the Big Bang
A) is still around today. B) broke down into electrons and neutrons. C) turned into dark matter. D) quickly burned into helium nuclei. E) was found in the globular clusters.
A simple beam AB with an overhang BC is loaded as shown in the figure. The bending moment at the midspan of AB is approximately:
(A) 8 kN?m
(B) 12 kN?m
(C) 17 kN?m
(D) 21 kN?m
________ is the study of the universe, including its properties, structure, and evolution
Fill in the blank(s) with the appropriate word(s)