Life on Earth can use a variety of different carbon and energy sources. However, the one thing that no organism on Earth can survive without is
A) water in any form: solid, liquid, or gas
B) oxygen
C) a liquid solvent of any kind
D) liquid water
D
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The short pulses and the discovery of the pulsar in the Crab Nebula are strong evidence that pulsars are _____
A) red dwarfs B) neutron stars C) giant stars D) yellow dwarfs
The second law of thermodynamics holds that:
a. matter can neither be created nor destroyed b. energy can neither be created nor destroyed c. whenever energy is transformed to another form, some is dispersed d. entropy decreases with time e. energy is the capacity to do work
UPC price scanners at supermarket checkouts use laser holography to read the bar codes because the packages are three dimensional
Indicate whether the statement is true or false
Sonic Booms: A jet flies at 1.4 times the speed of sound. What is the half-angle of the conical shock wave formed?
A. 30° B. 36° C. 44° D. 46°