bkpolymers1617 wrote:
Since medicinal products in the pharmaceutical industry have extremely brief shelf lives, manufacturers of medicines usually produce as much as possible in a short span of time,and this was a trend begun by the early manufacturers of chemical products in the nineteenth century, which is continuing in twenty-first century markets.
A) and this was a trend begun by the early manufacturers of chemical products in the nineteenth century, which is
B) which was a trend that began by the early manufacturers
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