4 thoughts on “Bill Nye on Evolution

  1. I don’t understand the point of your comment.Are you saying that speciation (of medium to large bodied) animals takes (significantly) less than “millions of years”?Your statement that the average lifespan is 2 years seems wrong. A quick Google of zebra, impala, lion, bear, gives average life spans (in the wild) of 10 to 20 years. Did you mean – a new generation every 2 years? Even that is too fast for those animals. Females become sexually mature at 2 to 4 years, and gestation periods are 4 to 12 months. So, you get a new generation in about 3 to 5 years.

  2. I prefer to subscribe to punctuated equilibrium. Some shift occurs in the environmental stresses a group of organisms face. Then the group of organisms shift in phenotype accordingly. In reality, most genetic traits tend to revert back to norms rather than tall people producing taller kids… or even kids who are half way inbetween their own heights… the heights tend to float right around average (in the average population this is).It’s also possible that the long necks of giraffes are not because it allows them to eat high up leaves… but consequentially has also given this ability. Much like the way that feathers didn’t arise because they allowed those with them to fly.

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