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Geological periods is a study guide that cites the different geological periods on Earth's timeline. Each has a brief ov..
The cell is defined as the fundamental, functional unit of life. Some organisms are comprised of only one cell whereas o..
Autotrophs flourished, absorbing carbon and light. Soon after, primitive life forms that could assimilate oxygen thrived..
The nucleus containing the genetic material, DNA, and the mitochondria, well-identified as the "powerhouse of the cell",..
Earth was created around 4.5 billion years ago and life began not long after. Primitive life likely possessed the elemen..