Much of this frozen glaciers and ice caps, so we don't consider is usable. a. salt water b. fresh water c. rainwater d. ice

Much of this frozen glaciers and ice caps, so we don't consider it usable freshwater.

This statement tells about the freshwater usage out of the whole water available on earth some are stored in the form of glaciers, ice caps, etc. Which cannot be used as freshwater.

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.

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be