It's called Entropy and ironically it is also responsible for life.
A wall tends to fall apart (and not the other way around) because these individual pieces have greater degrees of freedom (of movement) than the wall itself. Living beings, through their exchanges with the environment, breathing, consuming and excreting, end up increasing the degrees of freedom of the matter in their vicinity.
In more concise words:
"Life, as a highly organized system, exists in a state of relatively low entropy, while the universe as a whole is constantly moving towards higher entropy (more disorder) according to the second law of thermodynamics. It may seem paradoxical, a violation of a fundamental law of physics, but life actually increases the overall entropy of the universe as it utilizes energy and resources to maintain its own order, eventually releasing waste and heat back into the environment."
In short, life ultimately increases movement, transformation, decay, disorder and thus death.
Yup. 👍