Emma sings into a microphone. the sound is transferred from the microphone to a loudspeaker that is plugged into the wall. her voice comes out of the loudspeaker and sounds much louder than before. in this system, sound energy is being transformed into energy and then back into energy

Electrical energy and back to sound energy

Wetlands form where water and land meet. a lake with a wetland fringe can fill in with decayed plant and animal material to become a wet meadow. a pond can fill in to become a bog or fen. sediment can fill in a river marsh to become a swamp.flooding of coastal lowlands from rising sea levels has created broad coastal marshes that are protected from wave action by barrier islands or reefs. coastal wetlands also form when rivers deposit sediment as they reach the ocean. plants then take root and hold the soil firm against the forces of tides and waves.

1. protection 2. homeostasis 3. storage4.blood formation5.bone marrow 6.movement