先有鸡还是先有鸡蛋?这是一个古老而又耐人寻味的问题,迄今尚无圆满的答案,因它涉及地球上生命起源的问题——当今世界20个难题之一。几年前曾有学者提到,从生物进化和遗传基因角度来看,应先有鸡蛋后有 Is there an early chicken or egg? This is an ancient and intriguing question. So far there is no satisfactory answer because it involves the issue of the origin of life on earth - one of the 20 problems in today’s world. A few years ago, some scholars mentioned that from the perspective of biological evolution and genetics, there should be eggs after