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7-4 Cellular Diversity I. Variation in Cellular Life A. Unicellular Organisms- Single cell organisms including yeast, algae, bacteria and protozoa (Kingdom – Protista) B. Multicellular Organisms- organisms made of more than one cell 1. Cell specialization- the ways different cells have evolved to perform different tasks 2. Specialized Animal and Plant Cellsa. Red Blood Cells – lack a nucleus and carry oxygen b. Muscle Cells- contain multiple nuclei and specialized fibers (actin and myosin) c. Guard Cells- cells that control the air getting in to a plant’s leaf C. Levels of Organization- begin with cells 1. Tissues- similar cells grouped together for a similar function (muscle, nerve, connective or epithelial) 2. Organs- groups of different tissues working together to perform a function 3. Organ System- a group of organs working together to complete a specialized task