you can use resources to figure it out I use Plato to and it can be vague so it took digging to find the answer 
Internet: Websites should be from credible web addresses ending in .edu (an educational institution), .gov (government agency), or .org (non-profit). Any web pages that end in .com (commercial) or .net (networks) should be reviewed with caution.
Books, newspapers, and magazines: Examine the author’s qualifications. He or she should be educated in the field of nutrition/dietetics, and preferably hold a degree from an accredited university (RD, DTR, LD, or MD). These individuals should also belong to a credible nutrition organization.
Television: Make sure that the findings are well researched and repeatable; one study doesn’t make a finding absolute. Be critical and look for follow up studies.
For all media sources: Make sure the information is referenced with cited sources. Seek out multiple perspectives regarding nutrition advice, and ask a nutrition expert about the source of the findings. Ensure that the information is current and informing, not attempting to advertise or sell a product.
 
        
             
        
        
        
Cultural diffusion. Cultural diffusion is how all religion spreads.
        
                    
             
        
        
        
We are referring to any interference to the message or any distraction that prevent us in achieving our goal in doing the communication.
For example, when you're communicating with your friends on the sidewalks, the sound of passing cars that disrupt your message would be considered as a 'noise'
        
             
        
        
        
It should benefit the safety and diversity of the great society in humanity:)