For humans and most other mammals sex is a question is chromosomes. Two X chromsomes makes us... For humans and most other mammals, sex is a question is chromosomes. Two X chromsomes makes us... Contents 1 Creatures 2 Creatures sorted by: 3 Creatures by: 4 Amphibians 5 Arthropods 6 ... Contents 1 Creatures 2 Creatures sorted by: 3 Creatures by: 4 Amphibians 5 Arthropods 6 ...
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