Lecture 13: The Origin of Humans and Our Big Brains
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Questions and Answers

What was the defining feature of our earliest ancestors according to the text?

  • Bipedalism (correct)
  • Big brain
  • Hair reduction
  • Sun-skin contact reduction
  • What adaptation did early humans develop for life in the savanna?

  • Bipedalism (correct)
  • Hair increase
  • Decreased perspiration
  • Increased sun-skin contact
  • What purpose did hair reduction serve in early human evolution?

  • To reduce heat stress (correct)
  • To protect against predation
  • To increase sun-skin contact
  • To climb trees easily
  • Why did early humans evolve bipedalism according to the text?

    <p>To have free hands for collecting food</p> Signup and view all the answers

    What was the significant environmental change that influenced early human evolution?

    <p>Shift from dense rain forests to savannas</p> Signup and view all the answers

    Which continent is highlighted as the key site of human evolution in the text?

    <p>Africa</p> Signup and view all the answers

    What dietary factor is attributed to the rapid increase in brain volume once meat and stone tools were introduced?

    <p>Higher food quality of meat</p> Signup and view all the answers

    How does having a smaller gut contribute to the expansion of the brain in hominins?

    <p>By making food processing more efficient</p> Signup and view all the answers

    What facilitated the quicker energy assimilation leading to a larger brain size in hominins?

    <p>Use of fire</p> Signup and view all the answers

    What does the Juvenile Ape Hypothesis suggest about humans and chimpanzees?

    <p>Humans share more traits with juvenile chimpanzees</p> Signup and view all the answers

    How did the higher quality diet, as mentioned in the text, impact the brain size of hominins?

    <p>It contributed to bursts of brain expansion</p> Signup and view all the answers

    Which evolutionary concept, mentioned in the text, explains how hominins retained a more juvenile brain while maturing sexual organs?

    <p>Heterochrony</p> Signup and view all the answers

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