Letter D is the correct answer.
Even though both perspectives have the same object of study, both perspectives are equally useful since they provide different types of information. While microsociology focuses on smaller groups at a community level examining the interactions among individuals in their everyday lives, macrosociology emphasizes large-scale patterns and trends of populations and social systems.
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I believe the answer is: practice
To Be able to walk on his own, his body need to get used on sustaining the weight, and must be repeated over and over again to the point where the he could move the legs along with his body weight without losing any balance and fall over.
