Evolution is a fact, not a theory ~Carl Sagan (Part 2 of 2)

[alcojigmpfi]

how did the most furious dinosaurs become extinct?? and the ones weak ever survive, if that's because of the survival of the fittest, what happen to t-rex and brontosaurus, i think they are fit enough to live longer

[shishiromura]

@alcojigmpfi A meteor hit the earth. Then the kinetic energy caused some super valcanos to erupt on the other side of our planet.

[kidspirationtutorial]

@alcojigmpfi Hey man- being big and furious suddenly makes you less fit when the earths atmosphere is filled with smog and smoke- but smaller creatures, lower to the ground with better abilities for breathing such as insects and much later mammals with complicated breathing apparatus suddenly became more 'fit'.

[manic42018]

good vid orthough i would of sai at the point were we start to talk "thats were it all sarted to go wrong for us humans lol.

thanx for posting

[arkee71]

awesome!

[toelesshoe]

Carl Sagan certainly had the ability to convey complex explanations in a way that anyone, with a desire to learn, could understand. I encourage everyone to watch the entire Cosmos series