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16. The world's heaviest seed was found to be 19.8 kg. How heavy is it in pounds?

A. 43.56 lbs B. 4.356 lbs
C. 435.6 lbs D. 4 356lbs

17. The standard unit of area in the metric system is____________.

A. meter B. liter
C. square meter D. gram

18. The fundamental unit of volume is___________.

A. meter B. liter
C. square meter D. gram​