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The first one is which the second on is who

Give me branlest please

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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      hope this and if it does pls mark as branliest answer thx

answer; i believe that the correct answer is (north and south);