What cause competition?

competition is caused by more than one organism going for the same resource due to short supply of resources such as food water and space to live

Competition is an interaction between organisms or species in which both the organisms or species are harmed. Limited supply of at least one resource  used by both can be a factor.

Explanation:

False.

Sun is a natural resource. Which in turn is part of these four.
The four resources are:
1) Land - source of natural resources like oil, minerals (gold,ore,iron, sunlight, water)
2) Labor - human resources like employees
3) Capital - plants, machinery and equipment used to produce goods 
4) Entrepreneurship - the people who gather resources or marshaller of resources to produce final goods.