Which approach is currently proving to be the most promising way of determining how life on Earth originated?
A) studies of Martian meteorites
B) studies of organisms living around deep-sea ocean vents
C) studies of the fossil record
D) laboratory simulations of conditions present on the early Earth
D
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RC Circuits: When an initially uncharged capacitor is charged through a 25-k? resistor by a 75-V dc ideal power source, it takes 0.23 ms for the capacitor to reach 50% of its maximum charge? What is the capacitance of this capacitor?
Fill in the blank(s) with the appropriate word(s).
Results from the Phoenix lander and Curiosity rover suggest that the positive result from the Viking Labeled Release experiment was probably due to
A) the destruction of organic molecules by oxygen released when perchlorates in the soil decomposed on heating B) terrestrial contamination from the robotic arm which took the samples C) a malfunction in the experiment D) high levels of radioactivity in the soil
Adding heat to a body will ________ the mass of the body.
Fill in the blank(s) with the appropriate word(s).
If two children sit on a seesaw and one is twice as heavy as the other, in order to achieve balance the lighter child must sit
A. half as far from the fulcrum B. twice as far from the fulcrum C. the same distance from the fulcrum D. four times as far from the fulcrum