It can surface from adaptations in response to various environmental changes or the immune response of the host. All in all, the evolution of bacteria extensively refers to the heritable genetic changes that a bacterium collects throughout its life. Hence, bacteria have had a lot of time to adapt to their ever-changing environments, which lead to several descendant forms. Moreover, there are valid arguments that bacteria have been present since the early Precambrian time, which is about 3.5 billion years ago.īesides, bacteria and archaea were the most common types of organisms on Earth for about 3 billion years as multicellular eukaryotes did not emerge until around 1.6-2 billion years ago. There are bacteria fossils detected in rocks dating from around the Devonian Period (419.2 million to 358.9 million years ago). It’s a proven fact that bacteria have existed from exceptionally early in the history of life on Earth. Most importantly, bacteria are present in each habitat on Earth-like soil, oceans, rock, and even arctic snow. When it comes to bacteria classification, bacteria are classified into fixed major groups based on their fundamental shapes: rod, spherical, comma, spiral, or corkscrew. Furthermore, bacteria can use primarily organic, and a few inorganic elements as food and some can even survive excessive conditions. In fact, they support various forms of life, both animals and plants, and are also used in medicinal and industrial processes. A few bacteria are adverse, but the majority of bacteria serve a beneficial purpose. In fact, bacteria are found everywhere around, there are types of bacteria in urine and other parts of the human body as well. Thus, let us now know all about bacteria, types of bacteria, their evolutionary history, classification, and more.īacteria are considered to be microscopic and single-celled organisms that exist in millions, throughout the environment, both inside and outside other organisms. To support this fact, humans can trace their ancestry back to single-celled organisms. However, since the beginning, life has evolved into a myriad of life forms over many millennia. Even though the majority of bacteria make humans sick, they have an everlasting, mutual relationship with humans and are incredibly vital for human survival on the planet. Currently, bacteria are referred to as one of the oldest types of life on earth.
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