Level of organization - Representative organisms for level of Specialization
• Macro Molecule (non living) - Composed of atoms and molecules, able to carry out simple functions, e.g. enzymes, DNA, RNA
• Organelle (non living) - Composed of molecules and macromolecules, able to carry out complex functions like photosynthesis, respiration e.g. chloroplasts , mitochondria
• Cell (living) - Composed of macromolecules and organelles; the basic unit of living organisms, capable of carrying out all living activities, e.g. blood cells, phloem cells
• Tissue - Composed of similar cells specialized to carry out particular functions, e.g. muscle tissue in animals (contractile), epidermis in plants (protective covering)
• Organ - Body part, composed of several types of tissues, capable of carrying out a specialized function, e.g. heart in animals (acting as a pump) , leaf in plants (making food by photosynthesis)
• Organ system - Composed of functionally related organs, e.g. the circulatory system in animals consists of the heart, blood vessels and blood (for transporting materials throughout the animal) ; root system in plants
• Complex multicellular organism - Composed of several organ systems
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