This mode of reproduction is called asexual, and it is still used by many species, particularly unicellular, but it is also very common in multicellular organisms, including many of those with sexual reproduction. The biological cause for an organism developing into one sex or the other is called sex determination. Life has evolved from simple stages to more complex ones, and so have the reproduction mechanisms. In mammals, the fertilized embryo instead develops within the female, receiving nutrition directly from its mother. In humans, biological sex is determined by five factors present at birth: In both XY and ZW sex determination systems, the sex chromosome carrying the critical factors is often significantly smaller, carrying little more than the genes necessary for triggering the development of a given sex. Many plants, including conifers and grasses, produce lightweight pollen which is carried by wind to neighboring plants. In birds, which have a ZW sex-determination system , the opposite is true: However, no third gamete type is known in multicellular plants or animals. Conversely, there are also species in which there is no sexual specialization, and the same individuals both contain masculine and feminine reproductive organs, and they are called hermaphrodites.
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