Final answer:
A mass of cells that forms from cells dividing uncontrollably due to loss of cell cycle regulation is referred to as a tumor. This uncontrolled division can lead to cancer, with tumors being either benign or malignant. The correct answer to the question is a tumor. The correct option is a. Tumor
Step-by-step explanation:
When cells lose the ability to regulate the cell cycle, they may begin to divide at an unchecked rate, forming an abnormal mass known as a tumor. The process of cell division without control can lead to cancer, a disease where damaged DNA and mutations in genes that control the cell cycle result in uncontrolled cell proliferation. Exposure to certain environmental hazards such as radiation or toxic chemicals can cause this damage, leading to the failure of the body's mechanisms that normally regulate cell division. A tumor can be either benign, where it does not invade other tissues, or malignant, where it can spread and damage surrounding tissues.
Unlike a tumor, an embryo is an early stage of development in multicellular organisms, a fungus is a type of organism belonging to the kingdom Fungi, and stem cells are undifferentiated cells with the potential to develop into various cell types. Therefore, a mass of cells that forms when cells replicate uncontrollably is referred to as a tumor. The correct option is a. Tumor