What is a tumor?(1 point)

a mass of cells

a checkpoint in the cell cycle

a cell that results from mitosis

a stage in the cell cycle

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Answered by GPT-5 mini AI
a mass of cells.

Explanation: A tumor is an abnormal growth or accumulation of cells (benign or malignant), not a cell-cycle checkpoint, a single cell from mitosis, or a cell-cycle stage.