In what types of environments might life have originated?
What will be an ideal response?
Life could have originated on mineral surfaces near hydrothermal vents, where lots of prebiotic chemistry could have taken place. Alternatively, life could have originated on the surface as a result of a process similar to that occurring in the Urey-Miller experiment. The organic compounds from which life formed could have been produced within the atmosphere from UV irradiation or in lightning discharges. Alternatively, some complex prebiotic compounds may have been synthesized in interstellar dust clouds and brought to the Earth by interplanetary dust particles or by meteorites.
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Consider a piece of metal that is at 10°C. If it is heated until it has twice the thermal energy, its temperature will be
A) 20°C. B) 273°C. C) 293°C. D) 566°C. E) none of the above
The idea of base level refers to
A) an evolutionary cycle of landscape development from fluvial action. B) the amount of discharge in a particular reach of a stream. C) a level below which a stream cannot erode its valley. D) the stream gradient. E) the average height of a stream channel.
Which of the following pairs lists an r-selected organism followed by a K-selected organism?
A) grasshopper; whale B) elephant; pine tree C) elephant; whale D) pine tree; dandelion E) dandelion; pine tree
Predation is considered to be a(n) ________ factor.
A. Biotic B. Abiotic C. Extrinsic and biotic D. Intrinsic E. Extrinsic