What is characteristic of birds $(Aves)$ and mammals?

  • A
    Single and closed circulatory system
  • B
    Double and open circulatory system
  • C
    Double and closed circulatory system
  • D
    Single and open circulatory system

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Identify $X$ and $Y$ in the given schematic diagram of blood circulation.

Which part of the circulatory system serves to supply blood to the heart muscle itself?

What is a portal system?

Which of the following carries glucose from the digestive tract to the liver?

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