Fact 1: Sex hormones are chemical messengers that control sexual development and reproduction.

Fact 2: Chemical messengers carry signals from one nerve branch to another.

Given the two facts above, answer the question "_ carry signals that control sexual development and reproduction." with the following options: 
- photons
 - sex hormones
 - nerves
 - Most plants
 - organs
 - orchids
 - animals
 - insects


 

  sex hormones       