What is thermal energy?
the average overall volume of a system
the total number of molecules in a system
the kinetic energy of particles in a systemthe measure of temperature in a system

c is the answer because when something is left after something evaporates that shows the chemical change.

frequency, z, and the collision density, z, in carbon dioxide (co2), r 180 pm at 30 °c and 120 kpa

you did not give any options thus this is the best answer i can give to you with this little information you have given

> they are both natural and not man made

> they can be tracked and predicted by the right tools

-love shrooms

it's c (engineer's do their work with mechanical stuff not on any living being)