Which compound was abundant in precambrian earth’s oceans, before complex life evolved on earth? a. dissolved oxygen b. dissolved carbon dioxide c. dissolved methane d. dissolved ammonia

Dissolved carbon dioxide

Explanation:

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the most logical answer would be a

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.