Changes

== Sub-replacement fertility ==

== Sub-replacement fertility ==

Replacement fertility is the level of fertility that is required to sustain a population without any external inputs. In terms of [[sexual reproduction]] in human populations, replacement fertility is 2.1 children born per woman in a given population.  

Replacement fertility is the level of fertility that is required to sustain a population without any external inputs.  

 

In human populations, replacement fertility is 2.1 children born per woman in a given population.  

=== Film documentary Demographic Winter: The decline of the human family ===

=== Film documentary Demographic Winter: The decline of the human family ===