Our understanding of the atom has changed over time. which idea that was once accepted is now considered scientifically inaccurate?
a. the nucleus is the center of the atom.
b. an atom is solid material.
c. electrons have a negative charge.
d. electrons are arranged in layers.

answer; (d) spontaneous processes are characterized by the overall conversion of order to disorder;

32: from largest to smallest, this hierarchy includes eons, eras, periods, epochs, and ages.

33: answer is c

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