[Campbell Biology P.1103] Based on the provided text, which of the following statements about... | Practice Question

Based on the provided text, which of the following statements about extraembryonic membranes is INCORRECT?

  • A: The allantois disposes of wastes in reptilian eggs and forms blood vessels in the mammalian umbilical cord.
  • B: The yolk sac encloses yolk in reptilian eggs and is a site of early blood cell formation in mammals.
  • C: Both the allantois and yolk sac are unique to reptiles and are absent in mammals.
  • D: Extraembryonic membranes exhibit adaptations specific to development within a shelled egg or a uterus.

Explanation

The text clearly states, 'Thus, the extraembryonic membranes common to reptiles and mammals exhibit adaptations specific to development within a shelled egg or a uterus.' This contradicts option C, which claims they are unique to reptiles and absent in mammals.