Fact 1: Reproduction is the process by which living things give rise to offspring.

Fact 2: Physiologically, sex is for the purpose of reproduction.

Given the two facts above, answer the question "What gives rise to offspring?" with the following options: 
- sex
 - spring
 - bird
 - DNA
 - ova
 - production
 - factories
 - ovum


 

 sex        