Multiple choice

The observation of the recent studies about tropical birds is that

  1. compass sense alone cannot explain how birds navigate the ocean

  2. magnetite found in the bird�s head aids them in navigation

  3. migrants determine their geographic position on Earth by celestial navigation

  4. birds can keep trail of time without any sensory cues from the external world
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

�Recent research suggests that cells in the bird's head contain magnetite, an iron oxide crystal that aligns with magnetic north like a tiny compass needle.� gives us the answer.

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