Prompt Read Changes on Earth and Changes in Life. Explain how changes in Earth's systems affect the growth of life on Earth.
Use evidence from the text to support your answer
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the cell theory states that all living things including animals, as well as plants, are made of cells.

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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.