Plants, if your Catholic, came from God. When he made the Earth he made plants, water, animals, rocks, and things of that nature. Then he made man, Adam, and woman, Eve. Plants, if your not...
Oatmeal comes from oats. Oats are the seed grains of the common oat plant, Avena sativa. The oats can be cut into small pieces and/or rolled flat. Cook either form and you'll have oatmeal.
Any hybrid. There are billions of them. New plants are developed every day by botanists who will hand pollinate one plant with a different plant in the same family. The result is (hopefully) a new...