So there was Earth.
And on Earth formed the oceans.
In the oceans grew simple-celled life, and these are the prokaryotes.
From the prokaryotes grew complex-celled life, and these are the eukaryotes.
From the eukaryotes grew multicellular life, some of which photosynthesised, and thus came plants to grow on the land and in the waters of Earth.
Among the plants arose some that flowered and fruited, and these are the angiosperms.
Among the angiosperms arose some with a single seed-leaf, and these are the monocots.
Among the monocots arose the grasses, and among the grasses grew the ancestors whose progeny would become known to us as Cereals.
Earth now produces more than 2,500 million tonnes of cereals in a year.
50 grams of which are in my bowl of porridge.