The relationships between animals and plants demonstrate how an ecosystem works. Living things live together in communities, and in these communities the different species give and receive in mutually beneficial exchanges. Plants put some of the energy that they capture into making fruit. The animals eat the fruit and scatter the seeds. Both plants and animals benefit.
Some plants equip their seeds to fly with the wind.
Dandelion seeds floating in the air are good examples of this. Cottonwood seeds and milkweed seeds also float in clouds of fluff. On a windy day, floating seeds can be blown for miles. Other seeds let the wind spin them by growing propeller-like vanes. Maple seeds have this shape.