A skier can benefit from a training program because it could help them become better at skiing.
The activities performed in programs (such as a skiing training program) helps the person taking the course build their body strength and prepare for any upcoming games. Think about football practice. Why do they go to practice all of the time? They are going to prepare and get better at football. The same thing applies to skiing.
Different genes control the development of different characteristics of an organism.
The gallbladder is part of the biliary system of the digestive system
