Your 500-Million-Year-Old Brain - HHMI BioInteractive Video

[@SonKunSama]

Really high quality and very informative video. I'm surprised this hasn't got more views.

[@maxwellgarrison2983]

I used to not believe in evolution, but you really cannot deny that looking at simpler animals like this, which really are living fossils, for lack of a better term, that evolution is true. We are here looking at the missing link between the chordates and worms, probably a couple stages more advanced than the worms, three with the arthropods, and four or five from our last common ancestor with the echinoderms. Like many worms, this thing still has tentacles around its mouth, just like mollusks and arthropods (antennae), though I always thought they must be modified legs somewhere down the line, but now I think they were originally sensory tentacles. I imagine the Parazoans, tiny shapeless animals with ad hoc stomachs, scrounging around the bacterial mats of ancient Earth 500-600 million years ago, some began to move in one direction, rather than be mostly sessile (which became the sponges). The ones that moved became the bilaterians. Because the Parazoans are similar in behavior to amoebas, it makes sense that in the front they would have protruding tendrils of cells that would become tentacles as the cells became more and more differentiated and sensory in nature. In fact, considering that Echinoderm are actually bilateral, I would wager that their tube feet are highly derived forms of these tentacles emerging from some incredibly ancient animal that was little more than a creeping intestine with tentacles on the front. When you eat bacterial mats, wouldn't it make more sense to face down? By the time real fish emerge, like the lamprey, the tentacles are no longer needed because they have developed more sophisticated eyes and the lateral line.

[@kwic13]

"He's in the Devonian now." LOL

[@TZR8823]

Thanks from the core of my heart for this amazing video

[@biointeractive]

Glad you enjoyed it!

[@littleninjavangchhia9099]

I feel like we are just a natural mixture of elements having abilities so complex that I 'am watching this video right now.

[@bananicat8842]

Wow the view through the microscope was so damn clear! It's almost brainless! Crazy to see what evolution can do

[@shanthala1345]

Wonderful video , thanks a ton

[@biointeractive]

Glad you liked it!

[@zbferdous18]

M in 12standard it helped a lot clear the whole concept thankyouuu soo so much💜🇧🇩

[@biointeractive]

Glad it helped

[@arhsubayra3676]

This video just awesome ♥️♥️

[@parmaxolotl]

Damn who knew the Cambrian was still going on in my hometown

[@daytoday3779]

Gotta love homework

[@zungaloca]

beautiful

[@biointeractive]

Many many thanks

[@Howwerelivingfishing]

So cool

[@abhishekeducation9565]

Wow

[@sacapuntasfregerio4274]

so are we technically related to those things