QUESTION: Fix punctuation: In a twogeneration reproduction study decreased fertility was observed in rats exposed via inhalation at 1400 ppm but not at 500 ppm
ANS: In a two-generation reproduction study, decreased fertility was observed in rats exposed via inhalation at 1400 ppm but not at 500 ppm.

QUESTION: Fix punctuation: By doing this he found that his medicines instead of having as one would expect lowered therapeutic effect exhibited fewer side effects while retaining their potency
ANS: By doing this he found that his medicines, instead of having, as one would expect, lowered therapeutic effect exhibited fewer side effects while retaining their potency.

QUESTION: Fix punctuation: Maximum tensile strength 20 N
ANS: Maximum tensile strength 20 N.

QUESTION: Fix punctuation: No room they cried out when they saw Alice coming Theres plenty of room said Alice indignantly and she sat down in a large armchair at one end of the table
ANS:
No room!' they cried out when they saw Alice coming. 'There's plenty of room!' said Alice indignantly, and she sat down in a large arm-chair at one end of the table.