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Definition Maintenance of a constant internal environment is called homeostasis. Internal environment The internal environment is the immediate surrounding of the cell which provides the medium for the cell to survive. Tissue fluid around cells, plasma around blood cells and lymph are included in the internal environment. When the internal environment is constant, the conditions inside cells are also constant. If there is a small change in the internal environment, it affect

What is a Force? Force is a push or a pull acting on an object. A force is needed to start, stop, speed up, slow down, or change the direction of motion of an object. Unit of Force is Newton (N). A force always has: Magnitude Direction Therefore, force is a vector quantity because it has both magnitude and direction. Newton's Laws of Motion and Force Newton's First Law "An object remains at rest or continues to move with uniform velocity unless acted upon by an unbalanced for

Atoms and molecules are even smaller and exist in enormous numbers. Scientists use special quantities such as Relative Atomic Mass, Relative Molecular Mass, Avogadro Constant, and Mole to count them efficiently. Atomic Mass Unit (amu) The atomic mass unit is based on : 1/12 of the mass of a Carbon-12 atom. Relative Atomic Mass (Aᵣ) Definition : Relative Atomic Mass (Aᵣ) tells us how many times an atom is heavier than 1/12 of a Carbon-12 atom. Important : Relative Atomic Mass