MATERIALS blindfold PROCEDURE Explain that bat use sound waves, echoes and their ears to navigate at night.
(MATERIALS; blindfold; PROCEDURE Explain that bat use sound waves, echoes and their ears to navigate at night) Context(MATERIALS blindfold,List([0, 19))):(PROCEDURE; Explain; that bat use sound waves, echoes and their ears to navigate at night) Context(MATERIALS blindfold PROCEDURE Explain,List([0, 37))):(bat use sound waves, echoes and their ears; to navigate; T:at night)
MATERIALS blindfold,List([0, 19)) MATERIALS blindfold PROCEDURE Explain,List([0, 37))
MATERIALS PROCEDURE bat use sound waves, echoes and their ears
blindfold Explain to navigate
PROCEDURE Explain that bat use sound waves, echoes and their ears to navigate at night
that bat use sound waves, echoes and their ears to navigate at night
T:at night