Asentence that contains both dependent and independent clauses is known as a(n)
a. simple sentence.
b. complex sentence.
c. compound sentence.
d. independent sentence.

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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