1.   A synthetic chemical is, in theory, identical to that found in nature.

2.   Any synthetic chemical will carry with it a small percentage of undesirable substances which are not found in the essential oil.

3.   But above all, a synthetic chemical lacks the life-force found only in nature.

4.   Hormonally active synthetic chemicals can damage the reproductive system, alter the nervous system and brain, and impair the immune system.

5.   It is possible, however, that synthetic chemicals might affect the immune response in some way.

6.   Many of the compounds in question are members of a group of estrogen-like synthetic chemicals that are widespread in the environment.

7.   The arrival of synthetic chemicals revolutionized postwar agriculture.

8.   The theory is that industrial alcohol can desensitize some one to all synthetic organic chemicals, because it is derived from oil.

9.   Why are some people apparently made ill by everyday synthetic chemicals?

10.   And, of course, the plants must be able to produce reliably in a variety of climate conditions, without the use of synthetic chemicals.