Leaves are broad, thin and flat to provide a large surface area, to absorb sunlight for photosynthesis. :)
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The Alveoli
If the surface area of the organism is small, then there is no problem with getting all the oxygen needed. If the surface area of the organism is large, therefore a special respiratory surface is needed. An example is lungs, gills. The ratio of surface area to volume in a small organism is greater than the ratio in a large organism.
they have a wide surface area so they can absorb maximum light energy from the sun in order for the process photosynthesis to occur Hope this helps! :)