QUES: Stop the DNAliens becoming the powerful Humungousaur

correct the punctuation.

CORRECTED: Stop the DNAliens becoming the powerful Humungousaur.

QUES: From this time until his retirement in 1919 he held the chair of physics at Lund

correct the punctuation.

CORRECTED: From this time until his retirement in 1919 he held the chair of physics at Lund.

QUES: Grab coins kill creatures and watch for falling rocks

correct the punctuation.

CORRECTED:
Grab coins, kill creatures and watch for falling rocks.