On the one hand, children look better than their parents, largely because today's children look better than their parents, and parents may look many times better than your children when they were young! It's just that time is the knife that kills pigs. My parents are old, and their looks are not as good as when they were children. Naturally, I feel inferior to children. In fact, what you envy is not your children, but yourself as a child. Therefore, if you want to make people more and more beautiful, you can only make them younger and younger first, but time is the hardest. You can cut off everything that stands in its way. Nothing and methods can stop it from moving forward. Whether you pay attention to it or not, it is always there, moving at a constant speed.
On the other hand, from the perspective of genetics, if there is no cosmetic surgery the day after tomorrow, most of the factors that make children beautiful are because TA's parents are also beautiful. So, on the whole, only beautiful parents can give birth to beautiful children. But people in the world have different shapes, some are beautiful and some are not. So is the child. As long as the gene drift law of ugly people (dead without offspring) is similar to that of good-looking people, then human beings will not become more and more beautiful.
If one day, unattractive people can't find a partner or have children, then people in the world will become more and more beautiful. But it is almost impossible, because it is the instinct of human beings and any kind of creatures to breed, and the ugliest people can have children. Find someone uglier than TA.
Even if there are only beautiful people left in the world, things will not be as you wish, because people's aesthetics will change. Maybe what you think is beautiful now will become ugly or even ugly in a few hundred years. Maybe then I will think that those who were eliminated before will look good. What is the standard? It turns out that the world is always changing, just like the weather in June, people in love.
That is the improvement of living standard, environment and food.