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erma4kov [3.2K]
3 years ago
7

A kid on a playground swing makes 6 complete to-and-fro swings each 30 seconds.

Chemistry
1 answer:
Virty [35]3 years ago
6 0
The frequency of swings is 12 ans the perios of swining is 3 min.
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The answer is: D

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C. They have the same number of electrons.  is wrong, if they had the same number of electrons they must be they same element and they aren't the same.

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Sclerenchyma is the thick-walled cell tissue. In the beginning, the cell is living and have protoplasm, but due to deposition of impermeable secondary board lignin, they become dead thick and hard.

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