When sound waves hit a solid surface they either reflect, refract, or absorb.
Echo's are caused by the reflection of sound waves.
Autotrophs since they are self-feeders and make their own food instead of relying on others (the opposite is heterotrophs)
Talking of taxonomic kingdoms, the organism belongs to kingdom Animalia. Among other kingdoms, Archaea, Bacteria, and Protozoa are unsuitable since they include unicellular organisms. This organism can move freely from place to place, thus, it couldn't be neither Plantae nor Fungi, leaving Animalia as the only matching kingdom.
Speciation, the evolutionary process by which new species are formed, is clearly responsible for the ultimate generation of species diversity over geologic time.
