The natural elimination breeding method refers to the reduction of perceived interventions in the selection process of fine varieties, and as far as possible, the breeding method of determining the required fine varieties through the natural growth being screened. Which of the following are natural breeding methods? ['Turtle farms in order to breed disease-resistant breeding fish. When the turtles are near death, they do not apply any drugs and let them develop. The last ones are used as breeding fish.', 'Koi farmers start to pick the most economical fry from juveniles. After three manual fish selections, less than 10% of the juveniles eventually become fine koi.', 'Dendrobium farmers climb the inaccessible cliffs to collect wild Dendrobium, select some of them as species of fish, and carefully cultivate multiple new species.', 'Some plants growing on the same hillside, some of them are lush, others are weak and yellow, and they are distinct. This is exactly the image description of "natural selection".']