Question

how the human beings evovled

Answer 1

Human evolution. Human evolution is the lengthy process of change by which people originated from apelike ancestors. Scientific evidence shows that the physical and behavioral traits shared by all people originated from apelike ancestors and evolved over a period of approximately six million years. ... Humansare primates .

Answer 2

Before the complex life we all are leading now ,lets begin with the very first stage of formation:

STAGE 1:
SCENERIO: COMPLETE ABSENCE OF OXYGEN ,,,EARTH AS FIRE BALL

Enter of the anaerobic organisms called"CYANOBACTERIA"

they took carbondioxide and prepared energy giving out oxygen 
thats how the oxygen started to accumulate in the atmosphere 

STAGE 2:
ENTER OF AEROBIC BACTERIA
these cells started to form from the anaerobic bacteria and other organelles in the sea which accumulated in their bodies forming a new cell
they took the oxygen emitted by the cyano bacteria

stage 3:
later the more complex cells are formed from the pre existing cells 

complex....more complex...and even more complex cells frm pre existing cells

after a long period of time  cyanobacteria became ancestors of the most highly complex vertebrates called

HUMAN BEINGS..............

and they all lived happily ever after

hope it helps!!
courtesy:fire furry