Organisms that are found living kilometers beneath Earth's crust are referred to as
A) asthenophiles
B) magmaphiles
C) sublithophiles
D) endoliths
D
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Nellie pulls with a force of 50 N on a horizontal rope tied to a tree at rest. The net force on the rope is
A) 50 N and rope tension is 0 N. B) 50 N and rope tension is also 50 N. C) zero and rope tension is 50 N. D) zero and rope tension is also zero.
Suppose the distance to a star was doubled but everything else about the star stayed the same. What would happen to the star's luminosity?
A) It would decrease by a factor of 2. B) It would decrease by a factor of 4. C) It would increase by a factor of 2. D) It would increase by a factor of 4. E) It would remain the same.
Under what conditions will prebiotic molecules NOT be manufactured in Miller—Urey experiments?
A) if ammonia (NH3 ) is present in the flask B) if methane (CH4 ) is present in the flask C) if oxygen (O2 ) is present in the flask D) if carbon dioxide (CO2 ) is present in the flask
Just as a sustained flow of water in a hydraulic circuit needs a pump, the flow of charge in an electric circuit needs
A) current. B) voltage. C) resistance.