Between the four different types of cells you observed, (plant, animal, protist, bacteria) what do these structures all have in common?

The plant, animal, protist and bacterial cells have many organelles which are common to all these cells.

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explanation:

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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.