Which of these increases the level of carbon dioxide in the atmosphere? A. Driving a car
B. Traveling by plane
C. Cutting down trees
D. All of these

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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.