The most likely first form of life on Earth was probably an archaea-like extremophile tolerant of high temperatures
a. True
b. False
Indicate whether the statement is true or false
True
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In a fairly young star cluster, if the most massive stars are swelling up into giants, the least massive stars are:
A) also evolving off the main sequence as well. B) continuing to shine as stable main sequence stars. C) blowing off shells as planetary nebula instead. D) collapsing directly to white dwarfs. E) still evolving toward their ZAMS positions.
The expression(s) indicating the mass number of a nucleus is
a. A. b. N. c. Z. d. Z + N. e. A – Z.
A component in an automobile 12-V electrical system has a resistance of 90 ?. How much current is in the component when in operation?
a. 100 A b. 0.13 A c. 7.5 A d. 1100 A
Arsenic-doped silicon is
A) a material with holes as the dominant charge carrier. B) an n-type semiconductor. C) a p-type semiconductor. D) all of the above. E) none of the above.