Give reason: A sound wave is called a longitudinal wave.
b. A sound absorbing materials are kept in walls of cinema hall.
An echo is not heard in a small room.
d. A reverberation does not occur in furnished rooms,​

Ithink it’s: light bounce if off a mirror

This  kingdom  is  made  up of species that  do  not really easily fit into other kingdoms such as the plant, animal,and  fungi  kingdom. some protists, such as the paramecium  and  amoeba, feed  on  other  organisms  while others such as algae are able to  make their own food  through the process of photosynthesis.