A biome is a group of ecosystems that shares similar flora, fauna, microorganisms and climate. While an ecosystem is defined as the dynamic interactions between flora, fauna, microorganisms and their environment working together as a functional unit.The main difference between the two is that a biome consist of many similar ecosystems throughout the world grouped together. One of the problems encountered in the classification system of biomes and ecosystems is the transition zones that can make it difficult to determine exactly where one system begins and another ends. In any case,, roughly 29 percent of the land in Mexico is considered to be in desert or shrubland biomes while another 30 percent of the land consist of several different forest biomes. Additionally, Mexico is said to have 51 distinct ecosystems which makes it the most biologically diverse country in Latin American. For example, some of the ecosystems in the forest biomes of this country alone include coniferous forest, oak forest, tropical semi deciduous forest, mixed forest, cloud forest, deciduous forest and evergreen forest just to mention a few of the 51 possibilities. The photo essay below depicts a few of these ecosystems and includes additional information.