<span> It could be weight loss, decrease in muscle mass, changes in hair or skin, diarrhea, extreme fatigue, difficulty recovering from infection or injury, enlarged liver, edema, drop in blood cell number, and frequent colds.
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The cells of multicellular organisms become specialized for particular tasks and communicate with one another to maintain homeostasis. Specialized cells in multicellular organisms are organized into groups.
White blood cells (D) aid in the immune system to fight infections.