1. What’s the main purpose of the lecture?
- A. To explore a possible similarity between manatees and fish
- B. To explore recent research on animal hair types and her functions
- C. To show how marine mammals have adapted to various ocean environments
- D. To present a theory about the various functions of animals’ lateral lines
2. What are three factors mentioned by the professor that affect manatees’ ability to navigate?
[CHOOSE 3 ANSWERS]
- A. Their large body size
- B. Their poor vision
- C. Their inability to echolocate
- D. The rate of water flow in their habitat
- E. The level of visibility in their habitat
3. How do tactile hairs differ from other hairs?
- A. They are softer to the touch.
- B. They stimulate more nerves when they move.
- C. They can sense changes in temperature.
- D. They grow in straight-line patterns.
4. What does the professor imply about manatees’ tactile hairs?
- A. They might serve the same function as a lateral line.
- B. They probably evolve to help manatees hear better.
- C. They are useful only during a limited period of a manatee’s life.
- D. They are located only on the manatees’ faces.
5. What can be inferred about the recent research into manatees’ hair follicle sinuses?
- A. The research explains why manatees can survive on land as well as under water
- B. The research returned contradictory findings.
- C. The research has led scientists to search for hair follicle sinuses on other marine mammals.
- D. The research confirmed what one scientist had already suspected
6. According to the professor, what is a question that the researchers are investigating?
- A. How manatees’ navigational abilities compare to those of whales and dolphins
- B. How changes in water visibility can affect manatees’ ability to navigate
- C. Whether manatees can detect motionless objects in water
- D. Whether manatees can remember specific routes to food source