In what direction does heat flow? A. Heat flows back and forth between objects.

B. Heat flows from an object of higher temperature to an object of
lower temperature.
C. Heat flows from an object of lower temperature to an object of
higher temperature,
D. Heat flows only if objects are at the same temperature,

Ahypothrticalax type of ceramic material is known to have a density of 2.10 g/cm3 and a unit cell of cubic symmetry with a cell edge length of 0.57 nm. the atomic weights of the a and x elements are 28.5and 30.0 g/mol, respectively. on the basis of this information, which of the following crystal structures is (are) possible for this material: sodium chloride, cesium chloride, or zinc blende

Several kinds of bears are found on earth. most bears are brown or black, but one type of bear, the polar bear, is white. what process led to this difference in fur color? explain your answer.

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