The concentration of the particles in the solid phase always.

changes depending on how much quantity is present

remains the same regardless of how much quantity is present

increases with the amount present

decreases with the amount present

your mom.com . : 0000

it’s previous models   because when i picked that son of a gun’s answer it was wrong look for previous models because they might make it a different letter  

the transfer of heat by electromagnetic radiation is called thermal radiation . it is usually carried out by electromagnetic waves in an energy range just below the visible spectrum, which is the infrared range.

so the answer would be radiation.

: )