A long time ago, people were very different from the way we are now. For example, if you find a really old house somewhere, you'll see that the doors are usually much lower than those today. Why? Because hundreds of years ago, people were shorter.
Will our body be different in the future (未来) ? That's for sure. And the main reason is that we have more and more technology (科技) , and here are some other differences.
Most of us now have much better food than people in the past, so we grow more.
However, our body may not be as strong as now, because we won't do a lot of physical work,
Some people guess that our legs will get shorter and our feet will get smaller, because we use our feet less. At the same time, our fingers will get longer. And our fingers (手指) and our eyes will both get better, because they will have to do more work together with phones and computers.