Only the has successfully landed men on the moon.

The United States

The United States is the only country to have successfully conducted crewed missions to the Moon, with the last departing the lunar surface in December 1972.

Explanation:

answer: the rate of diffusion increases with increase in temperature.

increase in temperature, increases the molecular/particles speed (kinetic energy. diffusion means movement of particles through the material.

generally, the heavier the particle the more it interacts with the environment and more the temperature matters. so higher temperature results in higher diffusion.