Which of the following is true of the key principles of the life-span developmental approach?
A. The early periods of the life span are more important than the later periods of the life span.
B. Each period of the life span is affected by what happened before and will affect what is to come.
C. The early periods of the life span are unidirectional in their aspects.
D. Development in all periods of the life span are dependent on heredity and genetics rather than environmental influences.
Answer: B
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