Both outer and inner phenomena arise as a result of causes and conditions. Outer phenomena, the things of the physical world, arise in a series of seven steps. The texts use the example of a seed giving rise to a plant that gives rise to a fruit. The seven steps are: seed, sprout, leaflets, stemmed plant, bud, flower, fruit. Each stage succeeds the previous one in time and in order, each giving rise to the next.
Dharma Publishing, Ways of Enlightenment
buddhism, interdependent, pratityasamutpada, sutra