Because the early growing plant was constantly eaten the tree evolved seeds. The Trapezoido evolved to be a dicot because if the seed splits in two it allows no interference with the growth. The Trapezoido evolved to be multi-celled because it needed to be bigger. It needs to be bigger because it wasn't receiving enough sugars from photosynthesis so it needs more leaves. Photosynthesis Photosynthesis is the process of taking sunlight and transferring it into sugar.
Photosynthesis is an extremely important feature that all plants evolved.
In fact, plants came from photosynthetic algae in the water several billions years ago. Photosynthetic organisms capture sun light energy and use it to form carbohydrates and oxygen from carbon dioxide and water. I will talk more about the location of chlorophyll in the leaf section. Chlorophyll is what makes leaves green. When light strikes the chlorophyll the molecules are oxidized.