Fill in each blank with the correct word from the lesson.

1. Humans were inspired by bats and dolphins to invent _______ — ships send sound pulses into the ocean to map the sea floor and detect submarines.
2. _______ works in four steps.
3. They send clicks through a special _______ in their forehead called the melon, and hear the echoes through their jaw.
4. Echolocation — Nature's Sonar is an important topic in _______.
5. We can learn about _______ from this lesson.

Choose the best option for each question.

1. What is echolocation?
   a) Seeing in the dark with special eyesb) Using reflected sound to navigate and find objectsc) Sensing heat from other animalsd) Communicating using low sounds
2. What organ do dolphins use to send out echolocation clicks?
   a) Their earsb) Their tailc) The melon in their foreheadd) Their fins
3. Which human invention was inspired by echolocation?
   a) Radarb) SONARc) GPSd) Telescope

Write T for True or F for False in the brackets.

1. Using reflected sound to navigate and find objects is one of the key concepts in the lesson on Echolocation — Nature's Sonar.
2. Seeing in the dark with special eyes is the main topic of this lesson.
3. The melon in their forehead is one of the key concepts in the lesson on Echolocation — Nature's Sonar.
4. Their ears is the main topic of this lesson.

1. In your own words, explain what Echolocation — Nature's Sonar means.
2. List two things you learned from this lesson on Echolocation — Nature's Sonar.