Fact 1: Darkness has a negative impact on photosynthesis.

Fact 2: All plants live and grow by photosynthesis.

Given the two facts above, answer the question "What has a negative impact on plant growth?" with the following options: 
- disease
 - Pollution
 - nutrients
 - care
 - competition
 - darkness
 - light
 - Pesticides


 

      darkness   