If the conditions were right in the universe, life was able to take form. Earth was a planet which was right. The first living things on Earth, were single-celled micro-organisms or microbes lacking a cell nucleus or cell membrane known asprokaryotes,
Life, for all its complexity, is woven out of just 30 or so different molecules, constructed from some of the most abundant elements in the universe: oxygen, hydrogen, carbon, nitrogen, sulphur and phosphorus. However, no one has yet succeeded in synthesizing a “protocell” using basic components which would have the necessary properties of life.
Article ref: http://www.physicsoftheuniverse.com/topics_life.html
Over 4 billion years and a few extintion events that wiped out some life before us, the human species
began to form.
As the human species moved across the continents we began to take different shapes and sizes.
This was because we ate differently, we lived in different climates, some weather was cold, some was hot. We lead different lives, some of us started to build cities and others stayed in our original natural habitat. But, all of these different conditions caused differences between us.
Each continent had it's own condition and it had it's own type of affect on human life in comparison to when we had lived in the origin. Our DNA became diverse.
