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_______ (programmed cell death) only occurs in multicellular eukaryotes.

User Blegger
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Final answer:

Programmed cell death, or apoptosis, only occurs in multicellular eukaryotes. It is a mechanism for cells to die in a controlled manner when they are damaged or no longer necessary.

Step-by-step explanation:

Programmed cell death, or apoptosis, only occurs in multicellular eukaryotes. When a cell is damaged, superfluous, or potentially dangerous to an organism, it can trigger programmed cell death as a mechanism to prevent the release of potentially damaging molecules from inside the cell. This process allows the cell to die in a controlled manner. For example, in normal development, apoptosis plays a crucial role during embryonic development and metamorphosis, where cells are temporarily required for maturation processes.

User Fuzzy
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