What cause competition?

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:

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

colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.

evidence and logical support is essential for a scientist to do in order to maintain credibility. this is because no one can believe without any logic and without any evidence.hence a scientist can maintain credibility by proving himself and by answering logically so experiments prove very beneficial. logical hypothesis give conclusion which is acceptable. therefore, there are two main factors to maintain credibility by a scientist is evidence and logical support.