Sound is not heard clearly in big halls. Why?
Sometimes, sodium chloride solution is poured in a permutit vessel. Why?
If you are kept blind folded in a room, how can you find out whether the room is occupied by producing sound?
plz answer all the questions

Which are examples of how technology has advanced scientific understanding.1using hot water to sterilize medical equipment.2transplanting a human organ into another individual.3inserting genes from one sheep into another cell to make a cloneunderstanding the different structures that make up a cell.4examining microorganisms from the deepest parts of the ocean

Which type of precipitation would most likely form when the surface air temperature is slightly below freezing and the air temperature increases as you move upward away from the ground?

In salt water solution,the salt is the blank