Aperiod that is so important to development that a harmful environmental influence at that time can keep a bodily structure from developing normally or can impair later intellectual or social development is a(n)

The early development of child is a period that is so important to development that a harmful environmental influence at that time can keep a bodily structure from developing normally or can impair later intellectual or social development.

Explanation:

The early development of child between one year to six years has profounding impact  on their social and intellectual well being at later stages of their life.  

Based on research conducted by various institutions, it is found that environmental factors which are broadly categorized into the following has stimulating effect on child at later stages of their life:

answer; new forestry