Adirect relationship can be represented by:

A direct relationship between 2 quantities or variables may be a description of a specific approach that the 2 quantities or variables act with each other. once a amount or variable encompasses a direct relationship with another amount or variable, we are able to describe it employing a mathematical expression.

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.

it's c. elements are placed in rows based on how may valencies electrons have.