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Evolution of Island Birds: A Tale of Natural Selection

On a remote island, a population of birds faced drastic environmental changes due to climate shifts and the introduction of new predators. Over generations, those with shorter, stronger beaks thrived by adapting to the tougher seeds that dominated their diet during a drought. Birds with improved camouflage helped evade predators. As food sources fluctuated, the population exhibited remarkable diversity in plumage and size, reflecting their adaptations to the challenging ecosystem. This scenario illustrates the dynamic process of natural selection shaping species over time in response to external forces.

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Evolution of Island Birds: A Tale of Natural Selection

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  1. Do Now Using the theory of natural selection write a fictitious scenario of life for a population of birds on an island. Write about how the birds changed in response to external forces.

  2. POP QUIZ Please Define the following: Natural Selection Survival of the Fittest Adaptation Evolution Artificial Selection

  3. did humans evolve

  4. Evolution by Natural Selection • Descent with Modification • Over long period’s natural selection produces organisms that: • Have different structures • Establish different niches • Occupy different habitats

  5. The fossil record Geographic distribution of living species Homologous body structures Similaritiesin early development Physical remains of organisms Common ancestral species Similar genes Similar genes Concept Map Section 15-3 Evidence of Evolution includes which is composed of which indicates which implies which implies

  6. Evidence of Evolution • Fossil Record • Recorded history of life • Geographic Distribution of Living Species

  7. Figure 15–14 Geographic Distribution of Living Species Section 15-3 Beaver Beaver Muskrat Beaver andMuskrat Coypu Capybara Coypu andCapybara NORTH AMERICA Muskrat Capybara SOUTH AMERICA Coypu

  8. Figure 15–15 Homologous Body Structures Section 15-3 Turtle Alligator Bird Mammal Ancient lobe-finned fish

  9. The fossil record Geographic distribution of living species Homologous body structures Similaritiesin early development Physical remains of organisms Common ancestral species Similar genes Similar genes Concept Map Section 15-3 Evidence of Evolution includes which is composed of which indicates which implies which implies

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