Loss of endemic species unique to the region

Spread of invasive species from outside

Increase in migratory bird populations

Introduction of common widespread species

Sound waves pass directly through the wall and reappear on the other side.

Sound waves scatter randomly in all directions when they hit the wall.

Sound is absorbed by the wall and then emitted slowly.

Sound waves reflect off the wall and return to the listener after a short delay.

Displacement reaction

Double decomposition reaction

Combination reaction

Neutralization reaction