The appearance of a star to twinkle, or flicker, is caused by ____ of light through regions of different densities
A) reflection
B) refraction
C) diffraction
D) scattering
B
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Waste reduction is based on the four Rs: refuse, reduce, reuse, and recycle. From an environmental perspective, why is recycling the least preferred of these options?
What will be an ideal response?
The geographer Vidal de la Blache regarded food supply as
A) the weakest available example of a folk custom. B) the folk custom least closely tied to a particular climate. C) more subject to modification than weapons. D) less subject to modification than clothing and weapons. E) a limited resource that would not keep up with population growth.
The youngest event represented in this block diagram is
A. erosion of a canyon by a river. B. formation of the lowest layer. C. retreat of the seas. D. deposition of the top layer.
Acetylation of histones occurs at which residues of the protein?
A) cysteine B) histidine C) lysine D) phenylalanine