Fact 1: Plant reproduction often requires pollen.

Fact 2: Hay fever or pollen allergy is the most prevalent allergy.

Given the two facts above, answer the question "Plant reproduction often requires something that causes what?" with the following options: 
- mutations
 - bloom time
 - An earthquake
 - Steam
 - seeds
 - The common cold
 - gene flow
 - Allergies


 

        Allergies 