In mammals the key biological difference is that the male supplies sperm and the female provides eggs.
https://www.evernote.com/shard/s502/sh/89fc8f15-41a0-5f3a-fc89-32fd725ec8a1/
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In mammals the key biological difference is that the male supplies sperm and the female provides eggs.
https://www.evernote.com/shard/s502/sh/89fc8f15-41a0-5f3a-fc89-32fd725ec8a1/