The main reason why the testes are suspended within the scrotum is to provide cooler temperature for the testes and make it fertile for penetrating the egg. The Scrotum may contract or lengthen depending on the temperature of its surrounding.
Plants can synthesize all twenty amino acids. Humans must eat plants or animals to obtain some of these amino acids. Proteins are broken down into pieces when human eat it. This helps in providing proper metabolism to the system.
The correlation would be a "positive" correlation. It's not meaning that it's a positive thing to smoke. The graph suggests that the more cigarettes that are smoked per day, there's a more positive suggestion that your risk of lung cancer increases.
