When the seed of a flower-bearing plant matures, it has to make its way to favorable ground in order to be able to grow. It is desirable that growth takes place at a good distance from the parent plant; otherwise, too many plants of the same specie will grow on the same territory. This will have a negative impact on the conditions of their habitat. Proliferation of seeds can be accomplished by many different means; the makeup of every type of seed is highly dependent on the means by which it will be carried from the parent plant.
Seeds that are carried by wind (those seeds usually have the shape of a wing, or a boomerang) are usually light and have a large surface area. Seeds that are proliferated by animals either have thorns (which are used to cling to the fur of the animals), or they have a tough shell, which prevents swallowed seeds from being digested. A thick and fleshy outer layer usually surrounds those seeds that intend to end up in an animal's stomach. Finally, some seeds are shot away from the parent plant by internal strain forces once they reach maturity.
Press "Run" button to initiate the model. Press "Stop" to suspend the animation, and press "Reset" to return the model to its initial state.