Radiation
The fire radiates heat and the human body absorbs said heat.
A membrane that allows only some materials to move in and out of the cell is B. Semipermeable.
Light is a form of EM radiation.
EM radiation has no mass (it's just energy packets called photons).
EM radiation can travel through a vacuum. (The speed of light in a vacuum is called c and is around 300,000 m/s).
Hope this helps!
Blood circulating in your body.