Question

Technology used by bats to detect their distant obstacles in dark and fly easily:
a.RADAR,b.SONAR,c.X ray,d.sonography​

Answer 1

Answer:

b. sonar

Explanation:

Sonar is a right answer

Answer 2

sonar is the principle.

this is because, sonar stands for sound ranging and navigation, whereby they emit ultrasonic sounds which hit the obstacles and return back.