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Answer:
"humans cannot hear all the same sound frequencies as animals", & "Humans cannot make make all the same sound frequencies as animals" are correct. the other two are incorrect, hope this helps!
Balanced forces is the answer.
The uncertainty of the measurement is 0.001 gm.
The uncertainty in the measurement of a physical quantity is given as how precisely we can measure that, in this case as we can see that the mass of the sodium chloride is precisely given as 29.732 gm, this means the electronic scale is precise to 0.001 gm and round of the values after that which means there is a uncertainty of 0.001 gm.
