• Organisms proliferate.
  • The mechanism of cell proliferation is different in bacteria, animals, and plants.
  • Organisms proliferate through asexual or sexual reproduction.
  • Asexual reproduction is observed in many bacteria and microbes as well as in animals and plants.
  • Sexual reproduction occurs in many eukaryotes.
  • In sexual reproduction, meiosis results in the formation of haploid male and female gametophytes, and fertilization results in return to diploidy.
  • Whether haploid or diploid is predominantly observed in a life cycle depends on the organism.
  • The significance of sexual reproduction possibly lies in maintenance of species diversification and accurate maintenance of chromosomes.
  • The growth of organisms is influenced by environmental factors such as light, and the switch from vegetative growth to reproductive growth depends on seasonal changes.

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