5 ms·
"This is the first clear evidence that suggests our ability to produce sperm is very ancient, probably originating at the dawn of animal evolution 600 million y
by sigzero 16y ago
"This is the first clear evidence that suggests our ability to produce sperm is very ancient, probably originating at the dawn of animal evolution 600 million years ago,"
That is pure guesswork. You only have to read the whole article to see it is a "theory".
- sigzero 16y agoI would also add...cool none the less.