Acid rain is caused by

chemical reaction;sulfur dioxide and nitrogen oxides are released into the air

Explanation:

b. they require a huge investment of time, dedication ,training, and patience almost from the day they are born.

explanation:

the sentence gives a clear evidence of how carefully the sar dogs are selected and also specify from what time this exercise begins."almost from the day they are are born." this sentence shows as that this exercise begins early.

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newbie construction workers preparing to work at a job cite but are first going over safety concerns?