Which of the following best describes plasma?

a.) a group of super cooled particles with very low kinetic energy
b.) an ionized group of particles with low kinetic energy
c.) a gas that becomes a solid without first becoming a liquid
d.) an electrically charged gas with very high kinetic energy

they deliver oxygen to the blood

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.