paraphrasing

1)Human beings first developed in Africa and then they spread to other continents. 2)An interesting question in humankind's developmet is when did we begin to think critically? 2-1)When did we turn from animals focused only on the daily struggle to avoid starvation to humans who could think symbolically about the world around us? 3) A commonsense assumption is that higher levels of thought go hand-in-hand with verbal language, because higher thinking, such as creative thought, would naturally seek a means of expression. 3-1) Tracing the development of languafe could give an approximate idea of when humans began to think critically. 4) We do not have some fossil evidence related to speech. 4-1) By about 200,000 years ago, it had moved lower in the throat. this lowering provided a larger sound chamber (thr space in the throat and the mouth) in which passing air could be controlled by the tongue, making the articulation of wide range of sounds and rhythms possible. 5) humans were physically able to apeak around 200,000 years ago, but when did they actually start doing so? 5-1) no physical evidence of ancient language use, we need another approach to determine more precisely when humans began to speak- and to think critically . 6) no ohter animal is able to create or appreciate art; it is a uniquely human trait. 6-1) If ancient humans had the imagination to create to work of art(which in itself is a means of communication), then ir seems highly likely that they would possess the primary means of communicatation: language. 7) Until recently, the earliest art was believed to be cave paintings, carved figures, and jewelry found in southweatern Europe and thought to date from about 40,000 years ago. 7-1) this suggested that humans first became capable of critical thought about 40,000 years ago. 7-2) However, this time frame was recently overturned by an exciting discovery in South Africa. 8) based on Henshilwood's discovery, it seems that humans began to speak and think critically at least 70,000 years ago.