Brain death occurs when: all electrical activity of the brain has ceased for a specified period of time. a person remains unconscious for a specified period of time. only the lower regions of the brain stop functioning. the body loses the ability to breathe on its own.

The correct answer in A) All electrical activity of the brain has ceased for a specified period of time

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explanation:

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.