QUESTION: Fix punctuation: R 6820 Harmful possible risk of irreversible effects through inhalation
ANS: R 68/20 Harmful: possible risk of irreversible effects through inhalation
QUES: Using pegs on the brim will leave indentations and marks

correct the punctuation.

CORRECTED: (Using pegs on the brim will leave indentations and marks)
Question: for warts on the hands feet long treatment was based on use of products containing salicylic acid Newer treatments using aerosols to freeze warts use
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Answer: for warts on the hands, feet long treatment was based on use of products containing salicylic acid. Newer treatments using aerosols to freeze warts use.
MDS is a very complex disease

Can you repeat this sentence, but add in punctuation?
"MDS is a very complex disease
input: The versatile Nobo Folding Frame combines a TCard planning board inside with an outer surface suitable for writing or a magnetic display The white coated metal casing is
fixed: The versatile Nobo Folding Frame combines a T-Card planning board inside, with an outer surface suitable for writing or a magnetic display. The white coated metal casing is...
Using natural gas has a positive effect on composting scenarios that uses large amount of compensatory electricity The shift in energy carrier has therefore a negative impact in biogas scenarios because they generate most of their electricity from biogas

Can you repeat this sentence, but add in punctuation?
Using natural gas has a positive effect on composting scenarios that uses large amount of compensatory electricity. The shift in energy carrier has therefore a negative impact in biogas scenarios because they generate most of their electricity from biogas.