A dolphin perceives its environment by the sense of__________?
Correct answer: B. Both of these
- A. Sight
- B. Both of these
- C. Sound
- D. None of these
Explanation
Dolphins use vision to observe nearby surroundings and sound-based echolocation to detect objects, distance and movement, especially underwater. Therefore both sight and sound are involved.
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The human body is studied through its organ systems, including digestion, respiration, circulation, excretion, nervous coordination, reproduction and immunity. Coverage also includes nutrients and deficiency diseases, hormones, blood groups, common infections, vaccines, sanitation and basic first aid, while distinguishing communicable diseases from inherited and lifestyle disorders.
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