By significantly changing the size of the body, there would need to be a change in the shape of the body. Recent reports show that there's a whole generation of teenagers with overdeveloped thumbs due to playing too many video games. Muscles are able to adapt through excessive physical use, but this is not genetic. An individual may develop such a characteristic but will not pass this on to any offspring.
Many geneticists claim that something new is happening in human evolution - something along the lines of a 'grand averaging' of our species. Basically, we are becoming more alike. Human evolution relies on the differences in our genes and in our ability to pass on these genetic differences ie our breeding capabilities. Over time, the population should change as these differences become more apparent.
If the genetic changes are great enough, a new species will arise. However, the three components required for evolution to occur - variation, natural selection and geographic isolation - have more or less disappeared from the equation. Humans can be considered a single genetic 'continent' - meaning that the world's population is mixing and is no longer just breeding within cultural or ethnic groups. It is suggested that, given enough time, the human race will start to look more and more alike, becoming the 'average' of all the current different physical appearances.
The Australian Museum respects and acknowledges the Gadigal people as the First Peoples and Traditional Custodians of the land and waterways on which the Museum stands. Image credit: gadigal yilimung shield made by Uncle Charles Chicka Madden. Like early humans, modern humans gathered and hunted food. They evolved behaviors that helped them respond to the challenges of survival.
The first modern humans shared the planet with at least three species of early humans. Over time, as modern humans spread around the world, the other three species became extinct. We became the sole survivors in thehuman family tree. Modern humans almost become extinct; as a result of extreme climate changes, the population may have been reduced to about 10, adults of reproductive age.
Homo floresiensis becomes extinct, leavingmodern humans Homo sapiens as the sole survivor in the once diverse human family tree. Eventually, humans found they could control the growth and breeding of certain plants and animals.
As humans invested more time in producing food, they settled down. Villages became towns, and towns became cities. With more food available, the human population began to increase dramatically. Modern humans have spread to every continent and grown to huge numbers.
Producing our own food, rather than tracking it down daily, has freed us to enrich our lives in many ways—to become artists, inventors, scientists, politicians, and more. We have altered the world in ways that benefit us greatly. But this transformation has unintended consequences for other species as well as for ourselves, creating new survival challenges.
Scientists predict that in the future, computers will not only match the computational speed of the human brain, we'll also develop artificial intelligence that can speak, interact, listen, and remember.
Let's just hope they don't use all that information to turn against us. And as computers grow progressively more human, so too will humans become more integrated with robots. In the future, scientists predict that we'll have minuscule robots called nanobots swimming around our bodies and enhancing our natural abilities.
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