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Hormones are chemical messengers produced by specialized glands and they were produced by switching on the genes designe..
Ferns and their relatives are vascular plants, meaning they have xylem and phloem tissues. Because of the presence of va..
Humans are capable of only one mode of reproduction, i.e. sexual reproduction. Haploid sex cells (gametes) are produced ..
Darwin's Finches are an example of natural selection in action. They are an excellent example of the way species' gene p..