How can the design of a building, such as a concert hall, reduce unwanted noises and echoes?

The design of the building matters because sound bounces around, it is asorbed by soft material, If it is big and open you might have an echo, so the design affects how the sound bounces and echos, or how the sound is asorbed

To kill bacteria from our body especially from stomach

1) the mayans built pyramids just like the egyptians. the mayans also used hieroglyphics like them.2) power was passed down by family. for example, if the father dies, the son would be the next king.3)they both built pyramids for their structures.4)the main crop for the mayans was maize.5)they also grew manioc, beans,  squash,  amaranth, and chile peppers.