The existence of the universe is much older than its existence human. That is, this universe has long existed before man began inhabiting the surface of the earth. Humans are expected to begin to inhabit this earth at the time of Plestosen, while according to the age of the Earth when Plestosen is the youngest period. For more details try you look at the chart below this!
At the time of the archaeozoic, on earth there is no sign of life. The earth is still a hot gas that makes it impossible for living things to survive in such natural conditions. Eventually the gas temperature finally began to decline and some begin to harden to form the earth's crust. The palaeozoic period is also referred to as the primeval age of life at this time is expected to begin the existence of living things on this earth. Creature life that existed at this time is still very primitive. An estimated creature
who lived at this time is a single-celled and still very simple.
Mesozoic era is also called the middle life era. Period this is the second phase of the existence of living things. At this time it is thought to start living the animals of amphibians and reptiles. Large animals such as dinosaurs, tyranosaurs, and the like, live in this period so that this period is known as jura era.
Humans are not expected to exist at this time because of the natural conditions not yet possible for humans to survive. Try you imagine what if humans already existed at this time and should
coexist with other creatures of size very big body!
The kenozoic period is also known as the age of young life because is the youngest period in the earth's age and still prevails today this. The kenozoic period is divided into two ages, the tertiary age and
chronicles. In the tertiary age is expected to start appearing types a new animal that is a type of mammal animal. The animals large-sized gradually began to experience extinction in this day and age.
Man at this time should be able to adjust to the conditions natural. If they are unable to adapt to the environment living around then the threat of extinction will occur. They are able to survive would be able to continue life and gave birth to the next generation. Ability to defend themselves especially in adapting to changing natural conditions as well as the ability to obtain food for survival causing physical changes. This happens both in animals, plants and humans. Gradually human physical form experiencing a change so as to achieve the form we are today.