How did soldiers adapt to the use of chemical weapons? They built deeper trenches where they could breathe clean air.
They began to wear protective masks and clothing.
They fought mainly at night to avoid being seen and targeted.
They took new types of drugs to battle chemical weapons’ effects.

They began to wear protective masks and clothing.

B.) They began to wear protective masks and clothing.

Explanation:

a social contract.

"a social contract is an agreement between citizens and their leader where the citizens give up certain freedoms in exchange for protection. the constitution of the united states is an example of a social contract."

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