Explain howmuscle structure, a gene controlled trait, can be influenced by the environment

The simple answer is - imagine someone who is working out regularly and someone who isn't. 

The person who work out regularly may have more muscles than the other one, but at the same time, he has a worse genetic predisposition for muscle gain. The guy who does not work out on the other hand, has a better genetic predisposition for muscle gain, yet does not work out. 

This is how our environment can influence muscle structure. 

The main ideas because the other people

Air goes past the epiglottis and into the trachea when you breathe in. from there, it goes to your vocal cords in the larynx until it reaches the bronchi. from the bronchi, air passes into each lung.