To find a species that yield the most important substance and in which there are three types of interest by studying the growth of each of the selected type to the appropriate development and good products.
Find out what kind of yield and the most important ingredient. The third kind of interesting. By studying the growth of different types of selective breeding for good and appropriate to develop products.
Finding the species yield and material is the most important, which has three kinds of interest. The study on the growth of each type to a good selection and proper developed into a product.