Definition: The word "anthozoic" comes from Greek, meaning "ancient". It refers to an ancient period when life on Earth was quite different from today's world. It encompasses the time before the Cambrian explosion - approximately 546 million years ago - and includes many extinct animal groups. Definition: Ananthozoic is a term used in biology to describe an ancient, diverse and very early geological epoch that began around 546 million years ago. This time period was marked by significant shifts in life forms, including the disappearance of reptiles and birds as well as other mammals such as elephants, giant sloths and other extinct primates. This era also saw the extinction of many plant species due to a lack of suitable habitats, particularly those with abundant carbon dioxide (CO2) levels. The ananthozoic was characterized by the appearance of multicellular organisms that evolved from simpler forms, including diatoms and bacteria. The term "anthozoic" was used in science fiction and fantasy literature to refer to futuristic or imaginative settings where life on Earth was very different.
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