Nothing looked exactly like you 555 million years ago , but that ’s when life egress that looked like you in one all-important deference . What ’s the most basic thing that you share with some creatures and not others ? brain ? lung ? violent blood cells ? Nope . It ’s that you ’re two-sided . You have the ability to be cut into two identical sections , along one and one line only .
And we know to within 3 million years when the first “ bilateria ” seem . These creatures rollick an awe-inspiring innovation – a differentiate back talk and anus . Even more impressively , they had three little nerve bumplets along the line between the oral fissure and anus which , eventually , turned into the prosencephalon , the midbrain , and the rhombencephalon . These are the first animals to go down the bilateral trend which would finally take over the macroscopic world . These guy wire are the reasonableness you ’re not a hexapod .
Which does n’t mean these things look anything like you . There ’s a lively debate going on about what the earliest vulgar ancestor of every bilateral being looked like . It could have take care like a hairy lilliputian tube insect , or a drop , arrow - head - form leech . Some mass consider it hadmouth tentacles .
creative person ’s Rendering Of Earliest Common Bilateria .
Whatever it was , it deal something common to all of us , but something so vulgar and simple that we take it for give . So blink away your two eyes twice and clap your two hand together for our old relations .
double : Alvesgaspar .
EvolutionScience
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