The diversity of species decreases as we move from the equator to the poles because the sunlight is less visible due to the oblique sunlight but the equator having more direct sunlight rays. Cold regions are usually covered with snow up to 6-7 feet. So the topsoil has no vegetation at all due to the snow and the cold climate makes icebergs in the oceans.
Species diversity decreases as we move away from the equator towards the poles. What could be the possible reasons?