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Characteristics of Life In order for something to be considered alive, it must possess the 8 characteristics of life: Characteristics of Life • Growth • Death • Movement • Excretion • Reproduction • Sensitivity • Nutrition • Respiration Cells • All living things are made of cells. • The cell is the smallest living unit that exists. • There are two types of cells: plant cells and animal cells. • Plants cells have cell walls and chloroplasts (animal cells do not).