What does a total fertility rate that is less than 2.1 indicate? ...

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What does a total fertility rate that is less than 2.1 indicate?
 
  A) that a population has no natural growth
  B) that a population is growing slowly
  C) that a population is growing quickly
  D) that a population has reached its peak
  E) A TFR that is less than 2.1 has no particular significance.

Question 2

How does an open system contrast with a closed system?
 
   An open system is open to scientific scrutiny, while a closed system is not.
   An open system is able to convert energy from one form to another, while a closed system is not able to do so.
   An open system is prone to collapse, while a closed system is typically more sustainable in the long term.
   An open system exchanges energy and/or materials with its surroundings, while a closed system does not.

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Answer to Question 1

A

Answer to Question 2

 An open system exchanges energy and/or materials with its surroundings, while a closed system does not.