Mainly due to its presence, the human body remains without crushing even under high atmospheric pressure is (a) Strong skeletal system. The skeletal system provides essential structural support to the body, consisting of bones, cartilage, ligaments, and tendons. It forms a sturdy framework that distributes the body’s weight and withstands external forces. Without a strong skeletal system, the body would collapse under pressure, leading to severe injuries or even death. Additionally, bones protect vital organs, such as the brain, heart, and lungs, from damage. The skeletal system also serves as attachment points for muscles, allowing movement and locomotion. While other factors like fluid in cells, strong will, and firm muscular structure contribute to overall body function, it is primarily the strong skeletal system that prevents the body from crushing under high atmospheric pressure, ensuring structural integrity and survival.