1.   A bog garden is a natural extension of a pool in which moisture loving plants can be grown.

2.   A natural extension of the two approaches is to combine them and test both predictions at the same time.

3.   Automated sample-return missions are a natural extension of this category.

4.   Cloning cattle of proven performance seems the natural extension of these techniques.

5.   It seemed a natural extension of his arm.

6.   What a natural extension it would be to take Brady to visit historical sites related to those dolls and their historical eras!

7.   Even the plenitude of power is the natural extension of previous arguments.

8.   To Richard Gough local history seemed a natural extension of family history.

9.   And there is genuine interest, among newcomers, in new opera, a natural extension, it would seem, of considering opera as theater.