Answer:
precambrian time, and paleozoic era,
Explanation:
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D. To convert sound waves into mechanical waves.
Scientific laws or laws of science are statements, based on repeated experiments or observations, that describe or predict a range of natural phenomena. ... Scientific laws summarize the results of experiments or observations, usually within a certain range of application.
It means that gold weighs more than water technically and gold is more closely compacted in substance then water is
Answer: It’s B. testing the device on model cars in laboratory conditions
Explanation: Using real cars can just cause more actual accidents if the device doesn’t work.