The answer to this question is D: Psychoactive. It is the world's most widely consumed psychoactive drug.
Becausebof he law of conservation of evergy. Evergy can not be created of eliminated, therefore it has to be transfered in this case the energy is transfered from one organism to the otherand this process continues at an endless cycle
The build up in the child's ear prevent sound from reaching the eardrum.
the answer is b, faster through steel than through air.