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Dinosaurs represented a major turn in the evolutionary development of organisms on Earth. The first dinosaurs were presu..
The nucleus containing the genetic material, DNA, and the mitochondria, well-identified as the "powerhouse of the cell",..
Geological periods is a study guide that cites the different geological periods on Earth's timeline. Each has a brief ov..
The water cycle (also referred to as the hydrological cycle) is a system of continuous transfer of water from the air, s..