Fact 1: The Earth being tilted on its axis causes ones side of the Earth to receive less energy from the Sun than the other side.

Fact 2: Plants obtain their energy from the sun.

Given the two facts above, answer the question "What can cause plants to receive less energy" with the following options: 
- summer solstace
 - Dehydration
 - fossil fuels
 - exposure to cold
 - lunar orbit
 - They may not survive.
 - solar flares
 - the Earth being tilted


 

        the Earth being tilted 