Ebbie,

What you describe is entropy. In general all thinks go from a higher state of potential energy to a lower one and from more complex to less complex.

Think of the Biosphere of Earth as a complexity engine. The fuel is energy from the sun. Plants, animals and humans use this energy to grow and reproduce creating more complexity. Humans build things (like bicycles) which eventually decay. All this is due to the massive amounts of energy created by the entropy of the Sun.