Which element is used in light bulbs as filament

The formation of a solid, also known as a is an indication of a chemical change. precipitate particulate particle powder

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?

Select all of the methods through which a drug can enter your body. injection swallowing inhalation absorption