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Apt_5 t1_j6m3svb wrote

Reply to comment by CurrentDismal9115 in TIL When a cow has opposite sex twins, the female twin is usually born intersex and infertile. This happens because the twins blood supplies are linked, which exposes the female to male sex hormones. by awawe

This is still pretty basic biology. Not ELI5 basic but the concepts are fundamental and straightforward to understand.

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