The three main phyla of fungi are Zgomycota, Ascomycota and Basidiomycota. Three main phyla has there is a forth known as imperfect fungi. Fungi are divided into phyla primarily based on their reproduction structures. Most fungi are adaptable to more extreme environments than bacteria would be able to survive and thrive in. For example most fungi prefer lower pH levels that would be far too acidic for most bacteria. They also have the ability to flourish in low moisture environments, such as many of our foods that are spoiled due to these classifications of organisms. All fungi are chemoheterotophs, meaning they must absorb their nutrients, vice, ingesting it as those in the animal kingdom. They also have the ability to produce enzymes that deteriorate complex carbohydrates for metabolism. These enzymes adhere to the tissue of fruits for example, breaking down the skin of the fruit. Thus the reason, fruits turn dark when they begin to spoil. As stated above, fungi are classified into distinct phyla based upon their reproductive structures. Each phylum will be discussed separately with examples of organisms with in the phyla as well as important aspects associated with humans both positive and negative. Organisms within the phylum Zygomycota have the ability to produce both sexually and asexually. Normally reproduction is carried out asexually until condition become right for sexually reproduction. In the asexual cycle, sporangiospores are contained within the sporangium. When the sporangium breaks open the sporangiospores are able to germinate, leading to a new thallus, when suitable environment exist. In the sexually reproductive cycle, zygospores are release and protected with by a thick wall enclosing the spore until condition are right for sexual reproduction to take place, at which time the cells undergo meiosis producing haploid cells.