yes it was a very different world in the Jurassic. prior to the asteroid that collided with the Gulf of Mexico to cause the global environment, ecology, atmospheric conditions, everything to change drastically....... which enabled surviving mammals to develop, thrive and grow slowly mutating to different environments and forming new species and genuses.
a different world from the JURASSIC. an atmosphere that we homo sapiens would be unable to survive in.
and for your sins...... you can write a thousand times, I am a naughty boy.