Which of the following is not considered a potential solution to the question of why we lack any evidence of a galactic civilization?
A) The galactic civilization is deliberately avoiding contact with us.
B) There is no galactic civilization because we are the first species ever to achieve the ability to study the universe.
C) There is no galactic civilization because all civilizations destroy themselves before they achieve the ability to colonize the galaxy.
D) The galactic civilization probably is undetectable because they operate under different laws of physics from the ones we know.
Question 2
Scientific models are used to ________.
A) make miniature representations of the universe
B) present the scale of the solar system to the general public
C) prove that past paradigms no longer hold true
D) make specific predictions that can be tested through observations or experiments
Early in the twentieth century, when malnutrition was common, companies such as this one advertised
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