Which characteristic is not a characteristic of plastic? A.) easy to mold
B.) good conductor of heat
C.) lightweight and durable
D.)Repels water
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the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.

it's c (engineer's do their work with mechanical stuff not on any living being)