Bacteria rule the world. Man is dep

Bacteria rule the world. Man is dependent upon them from the day of his birth until the hour of his death. They are man's most useful servants and his most destructive masters. One is prone to ask: What are bacteria? Where do they occur? What are their functions?

Bacteria are minute single-celled living beings devoid of roots, leaves and stems. They are so small that they can be seen only with the aid of a powerful microscope; They are often spoken of as microorganisms. This term includes not only bacteria but all forms of life so small that you should require the microscope in their study. They are often referred to as germs or microbes. The early investigators considered them animals and would refer to them as «animalcules».

If we examined the bacteria we should find that they have many of the characteristics of animals. Some have the power of independent motion. All are devoid of green colouring matter, chlorophyll; most of them are compelled to live upon complex foods as do the animals. Their general structure, their methods of growth, their formation of threads and spores, and their simplicity in some of the lower forms of plant life, have caused the biologist to class them as plants. However, it is impos-

sible to make a clear-cut1 distinction between some microscopical plants and some microscopical animals. The important thing to remember is that bacteria are the simplest forms of life, and partake of the characteristics of both plants and animals. For this reason, and for convenience, scientists agree to consider the bacteria with the plants.

Where do bacteria occur? Bacteria are widely distributed, occurring nearly everywhere. They are found in all natural soils, the number varying with the kind of soil, quantity of plant and animal debris present, moisture and treatment. They decrease in number with depth. Although they occur in air, it is not their natural home as under ordinary conditions they cannot grow and multiply in it. The number and variety found in air vary. The atmosphere of some high mountains and the air over the ocean far from shore may be free from bacteria. City and country air also differ from each other in the number and kind of bac- teria which they contain. There is a great variation in the air of buildings. Bacteria are especially numerous where dust is plentiful.

Результаты (английский) 3:

细菌统治世界。人从出生那天起就依赖于他们，直到他死的时候。他们是人类最有用的仆人和最具破坏性的主人。一个很容易问：什么是细菌？他们是在哪里发生的？它们的功能是什么？

细菌微小单细胞生物没有根、茎和叶。它们是如此之小，以至于只能借助强大的显微镜来观察它们，它们通常被称为微生物。这个术语不仅包括细菌，而且所有的生命形式都很小，所以你需要显微镜的研究。他们通常被称为细菌或微生物。早期的研究人员认为他们的动物，会把他们称为«微生物»

。如果我们检查了细菌，我们应该发现他们有许多动物的特性。一些有独立运动的力量。所有的都是没有绿色的色素物质，叶绿素；他们中的大多数是被迫生活在复杂的食物，因为动物。它们的一般结构，它们的生长方法，它们的形成的线程和孢子，他们的简单性在一些较低的植物生命形式，使生物学家以植物类为植物。然而，这是不可能的-

使clear-cut1区分一些微观的植物和一些微观的动物。要记住的重要事情是，细菌是最简单的生命形式，和分享的植物和动物的特征。为了这个原因，为了方便，科学家们同意考虑细菌与植物。细菌分布广泛，几乎无处不在。在所有的自然土壤中，土壤、植物和动物的数量、种类、数量、种类、数量和种类都有不同程度的变化。随着深度的减少。虽然它们发生在空气中，这不是他们的自然之家，因为在一般情况下，他们不能成长，并在它。在空气中的数量和种类不同。一些高山和海洋上的空气可能从没有细菌的空气中释放。城市和乡村的空气也彼此不同的数量和BAC标准所包含的种。建筑物的空气有很大的变化。细菌是特别多的，其中灰尘丰富。