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Difference between revisions of "Singer"
→Sexes and reproduction
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Singers cannot switch between male and female or malen and femalen by biological means, though it is possible to do so through Invested means.{{cite}} Their sex-determination system is unknown, and following from the inability to switch between male and female, ultimately decides between two sexes, despite the their tetramorphism. Their ability to breed with humans implies that they possess an [[wikipedia:XY sex-determination system|XY sex-determination system]], but this is not confirmed.{{wob ref|3922}}{{wob ref|5782}}
Due to the presence of internal organs;{{cite}} the presence of skin, hair, and nails;{{cite}} the implied presence of neural tissues, and the presence of bilateral symmetry, they can be assumed to to triploblastic. That is to say, possessing of three primary germ layers of the gastrula during embryonic development.
==== Interspecies Breeding and Introgression ====
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