This is a multigenerational pattern of change known as a secular trend. It is an adaptation of the organism's expression dependent on the surroundings.
What is meant by a Secular trend?
In the past century, there seems to be a startling trend toward children of all ages getting bigger and bigger. The "secular trend" is what is meant by this. The scale of the tendency in America and Europe is so great that all dwarfs the variations among social strata.
Causes of these things-
The secular tendency has several potential causes.
Therefore it is concluded that the correct choice is option (C) secular trend.
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