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What ensures that a species' chromosome number stays constant generation after generation, despite germ cells having half the number? full number

Question
What ensures that a species' chromosome number stays constant generation after generation, despite germ cells having half the number? full number
Random chromosome loss during development
The fusion of two germ cells (each with half the number) at fertilisation, restoring the
Chromosomes double spontaneously with no fertilisation needed
Chromosome number is not actually constant across generations
Answer
The fusion of two germ cells (each with half the number) at fertilisation, restoring the
Detailed Explanation
Fertilisation fuses two half-sets of chromosomes (one from each germ cell) to restore the species' normal, stable chromosome number in the offspring.
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