David Christian describes the history of the world in 18 minutes. In the video[D1]  he talks about
the sequence from the Big Bang, the creation of the universe, the stars, and ultimately[D2]  the
planet Earth. According to Christian, the earth was created by exceeding the fourth threshold of
complexity. After crossing the fourth threshold of complexity, organisms began to form on our
planet. At first, on the earth[D3] , unicellular organisms began to become more complex and
sophisticated over time. The result was dinosaurs, but as we know [D4] they were annihilated by the
impact of an asteroid on Earth. What was a disaster for dinosaurs was a lottery win for mammals.
This is because DNA learns[D5]  to create perfect brains that are capable of reading in real time,
sharing knowledge and learning. And so, our history came into being.


Nicely done, very good usage of linkers and grammar.
________________________________

 [D1]video,

 [D2]ultimately TO – you started with FROM, end with TO

 [D3]Earth

 [D4]Avoid personal pronoun – but those were

 [D5]Learned? Not sure how this thought is connected to the dinosaurs though.