Add punctuation: Brake chambers and fuel tanks are positioned well protected on the chassis
A: Brake chambers and fuel tanks are positioned well protected on the chassis.
QUESTION: Fix punctuation: By means of backing slides or backing paper the replicas are made thin and flat thus they can be mounted on slides using doublesided adhesive tape 1 specimen and 2 replica
ANS: By means of backing slides or backing paper the replicas are made thin and flat, thus they can be mounted on slides using double-sided adhesive tape. 1 specimen and 2 replica.
QUES: Over time this belly fat accumulates and bowel movements just are not able to discard it from your body

correct the punctuation.

CORRECTED: Over time, this belly fat accumulates and bowel movements just are not able to discard it from your body.
Question: Adjust the seat height to obtain an angle of 90 degrees between your body and arms
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Answer: Adjust the seat height to obtain an angle of 90 degrees between your body and arms.
Right from the start workshops take great care in finding out everything they need to know from the trucks specification to the number of drivers the routes taken and your schedule

Can you repeat this sentence, but add in punctuation?
Right from the start, workshops take great care in finding out everything they need to know, from the truck's specification to the number of drivers, the routes taken and your schedule.
QUESTION: Fix punctuation: There were 9 randomized controlled trials 23 nonrandomized controlled studies and 15 observational studies in this review
ANS:
There were 9 randomized controlled trials, 23 nonrandomized controlled studies, and 15 observational studies in this review.