Notes from NEET topper
3. Levels of Organization:
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Animals exhibit various levels of organization:
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Cellular Level: Some simple animals, like sponges, are organized at the cellular level, where individual cells perform all necessary functions.
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Tissue Level: More complex animals have tissues that specialize in particular functions, such as muscles and nervous tissue.
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Organ Level: In higher animals, organs are composed of different tissues working together, e.g., heart, liver, and lungs.
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Organ System Level: Animals with multiple organs form organ systems (e.g., digestive, circulatory, and respiratory systems) that coordinate various functions.
