Impressions of tropical swamp plants were observed on rocks in polar regions. the impressions were dark black imprints, which means the fossils are examples of . the fossils tell us that polar regions .

The first blank is trace fossils and the second blank is had tropical plants that could grow in the ice.

1st one is carbonization and the second one is and might have had a different climate in the past

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.