Taller trees have a canopy arrangement of leaves where the upper leaves tend to be smaller than the ones below them. how does this arrangement of leaves benefit the plant?

This arrangement of leaves benefit the plant by allowing the light from the sun to all parts of these trees. Having larger leaves above, will block sunlight to reach the lower part of the tree.       

The speed of  sound:   sound travels  at different speeds depending on what it istraveling through. of the three mediums (gas, liquid, and solid)  sound waves travel the slowest through  gases, faster  through  liquids, and fastest  through  solids.