Classification determines methods for organizing life on Earth. It is a process that reflects the very nature of organisms, which are subject to change over many, many generations in the process of evolution.

Since life first appeared on Earth 3.5 billion years ago, many new types of organisms have evolved. Many of these organisms have become extinct, while some have developed into the present world. Extinction and diversification continue nonstop, and scientists are often encountering fluctuations that may affect the way an organism is classified.

When classifying organisms, scientists study a wide range of features, including those visible to the naked eye, those detectable only under a microscope, and those that can be determined only by chemical tests.

Scientists compare the external shapes and sizes of organisms as well as the anatomy and function of internal organs and organ systems, such as the digestive or reproductive systems.

Harmful Fungi: Fungi cause about 100,000 diseases of plants, including about 70 percent of the major crop diseases, resulting in an economic loss of billions of dollars each year.

Plants range in a variety of sizes and shapes. Only a tiny percentage of plant species are directly used by humans for food, shelter, fiber, and drugs. Rice, wheat, corn, cotton, and tobacco, are some plants that economies and nations depend on. Humans benefits from the entire plant kingdom and its more than 1 billion years of photosynthesis. Plants have made the fossil fuels that provide power for our industries. Plants have supplied sufficient oxygen to the atmosphere to support the evolution of higher animals.

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