Natural Sciences refer to various fields of scientific study that concern the physical and natural world, including aspects such as biology, chemistry, physics, and geology. There are a few synonyms for Natural Sciences, including Physical Sciences, Life Sciences, and Natural Philosophy. Physical Sciences specifically refer to the study of non-living systems and processes such as mechanics, optics, and thermodynamics. Life Sciences, on the other hand, focus on living organisms such as plants, animals, and humans, and their biological processes. The term Natural Philosophy was commonly used in the past before the division of scientific fields, and encompassed topics such as astronomy, physics, and biology.