Which of the following was an effective method of protecting soldiers from chemical warfare during world war i
trench warfare
gas masks
zeppelins
infantry attacks

Gas masks

Explanation:

The use and quantity of gas masks increased considerably at the beginning of the First World War because during this period the most lethal chemical weapons in history were created and used experimentally. Its use was very important, since in their time they were used against gas bombs and other chemicals already invented, which could be lethal and cause death.

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