The next level of idea importance, or the "second level of subordination" must be units chapters topic sentences chapter subdivisions

Ideas should be ordered from general to specific, likewise from abstraction to concretion; the more general the idea the higher the level of significance, which provides logic to the work. Thus subdivisions ought have affinity with the whole.

Chapter subdivisions are chapter within chapters, with a chapter being one of the major divisions. Therefore the "second level of subordination" is "Chapter subdivisions"

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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what are the sentences?