The Earth: The Third Planet In The Solar System

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Our planet, the Earth, is the third planet from the Sun, and usually is known as the Blue Planet. Its location in the Solar System and the particular characteristic of being the only planet with abundant water, have made possible the development of life here. Thousands of millions of years ago, the first living organisms evolved from a non-living matter, and since then the Earth has been inhabited by many different species. Those, who have dedicated their research to study and classify living organisms, best known as taxonomists, have divided them into categories, taking as a definition pattern the principal features of each species. In this manner, the living organisms can be classified into five Kingdoms: Animal, Plants, Fungi, Bacteria,…show more content…
They are single cellular microscopic organisms that are structured by well-defined elements, which each of them have a specific function, such as the ribosomes, the plasma membrane, and the cell wall. There are defined three type of bacteria based on their shapes. The rod shaped bacteria are called as bacilli, and of example is the Bacillus anthracis, best known by be the cause of anthrax. Another of the classification are the spherical shaped bacteria, they are called cocci, and as the best-known example is the Staphylococcus bacteria. The last from of bacteria is he curved shaped, called as spirilla, and it can be seem in the Spirillum minus, a bacteria associated with the rat-bite fiver. Most of these bacteria develop a type of reproduction based mainly in cell division, known as binary fission. In here each daughter cell contains the same DNA of the parent, as an identical clone. This mechanism of reproduction possessed by the bacteria and their capacity of adaptability to any hostile environment, have made possible they used in important fields on the human life, as in the medicine, to produce antibiotics such as streptomycin and nocardicin; and also are used in the food industry, to put the tang in yogurt and the sour in sourdough bread. But they are some bacteria that can be really harmful, as parasites or pathogens that cause disease in plants and animals, including human beings, for instance…show more content…
Most of them are multicellular organism, with the exception of a few that are single cells called yeasts. In the beginnings of the studies of the living organisms the fungi was related in a closer way with the plants, because of similarities in lifestyle. But with the development of the Mycology, which is the branch that study the fungi, it was found that the fungi, even thought have similar characteristics with the animals and plants, it constituted a unique kingdom itself. One of the most general misunderstanding related with the fungi, is that it’s common to think that, as plant, they use the process of photosynthesis to elaborate their food, but they don’t. Instead, they used a method more similar to the animal digestive process, by using enzymes that break down nutrients into smaller pieces that they can then absorb. Fungi can cause a number of plant and animal diseases: in humans, ringworm, athlete 's foot, and several more serious diseases are caused by fungi. Because fungi are more chemically and genetically similar to animals than other organisms, this makes fungal diseases very difficult to treat. Many studies and researches are destined to investigate how to prevent and control the impact of Fungi in human society. Fungi are tremendously important to the planet we live on. They provide fundamental products including foods, medicines, and enzymes important to

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