1.   And through the soul, they shape behavior.

2.   But biology, Calvin said, has limited impact in shaping behavior.

3.   But even if such a gene exists, it would be unlikely to shape human behavior as strongly as the fly gene molds that of the male fruit fly.

4.   But using it to shape behavior in higher animals would cause ethical problems, said Chapin.

5.   He theorizes that this is all due to pheromones, those mysterious secretions that can shape behavior.

6.   Helms reaffirmed his reputation as someone who would not shape his behavior to suit the current fashion.

7.   Like any other feature of an organism, behavior can be shaped by evolution.

8.   Nature has a third option for shaping behaviors -- the absence of positive reinforcement.

9.   No evolutionary scientist would dispute that culture is a powerful influence, or that environmental forces shape behavior.

10.   Now you can shape behaviors with an accuracy impossible to someone who merely tosses fish around.