[Campbell Biology P.1140] A newly discovered vertebrate species, 'Aqua Navigator,' primarily ... | Practice Question

A newly discovered vertebrate species, 'Aqua Navigator,' primarily navigates complex underwater environments using subtle changes in water currents and highly precise body movements. Based on the information provided, which brain characteristics would you MOST LIKELY expect to find in 'Aqua Navigator'?

  • A: A relatively small olfactory bulb and a large cerebrum for advanced cognitive processing.
  • B: A highly developed cerebellum and a prominent midbrain.
  • C: An exceptionally large forebrain, dominating the overall brain size, with a focus on learning.
  • D: A hindbrain primarily dedicated to processing visual information and complex learning.

Explanation

The description 'navigating complex underwater environments using subtle changes in water currents and highly precise body movements' aligns with the functions described for the midbrain and cerebellum. The midbrain 'processes input from the visual and lateral line systems,' which would be crucial for detecting water currents. The cerebellum 'controls movement in three dimensions' and is large in 'free swimming ray-finned fishes, such as the tuna,' indicating its role in precise motor control.