1. Why can fancy traits, like long tail feathers that make flying more difficult, evolve even if they make survival less likely?
  2. In a particular bird population, males with the longest and brightest tail feathers get more mating opportunities. Do you expect males in this population to grow longer and longer tails indefinitely? What might prevent long tails from evolving ever longer?
  3. Why do you think it is more common for male birds to evolve fancier traits than female birds?

  1. Why do you think there were so many heated debates around the development of the cell theory?
  2. Can you describe a time when collaboration worked well for you? Where there ever any disagreements that led to a false assumption (like cells spontaneously crystalizing into existence)?

  1. How did our planet end up with so much water, and where did it come from?

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