Fact 1: Darkness has a negative impact on photosynthesis.

Fact 2: Plant growth is dependent on photosynthesis.

Given the two facts above, answer the question "What has a negative impact on plant growth?" with the following options: 
- Pesticides
 - competition
 - bees
 - wind
 - Darkness
 - Pollution
 - disease
 - rain


 

     Darkness    