How is the radiotracer used to treat thyroid disorder?

Which type of fossil does this image depict?

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?

The diagram below shows the movement of particles. what does this piece of evidence best support? the collision theory the maxwell-boltzmann distribution the effect of pressure on reaction rates the effect of temperature on reaction rates