A few examples on the spread of seeds with the help of wind, water and humans.

With the help of the wind, for example, a dandelion seed was blown away by the wind to another place, then new dandelions grew there.
With the help of Water, for example, a dandelion grew near a reservoir, its seed was washed away by water and washed ashore, where a new dandelion grew.
With the help of a man, for example, the same dandelion grew in a field where a man walked and touched a dandelion with his clothes, then fell in another place. As a result, a new dandelion.