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To find out what drives this freaky cellular behavior, Higginson and her colleagues investigated the female and masculine reproductive tracts of 42 species of diving beetle. They looked at factors including sperm measurement, length of the sperm head, length of sperm tails, mob of conjoined sperm and shape of sperm heads. In females, they examined the in detail of the reproductive ducts as well as the size of the sperm-storage areas. They then utilized statistical methods to tease out relationships between male and female reproductive systems.

The results revealed that ancestral diving beetle females had direct reproductive tracts. But for reasons unknown, the female tracts evolved to be more and more complex. Sperm, in become capsize, had to change to thrive in this new environment.

"We can reconstruct what the ancestors of these diving beetles looked like," Higginson said. "We find they had conjugated sperm and rather condensed female reproductive tracts. The female morphology undergoes evolutionary switch , and then sperm compensates for that.

Source: msnbc.com

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Source: Swiss Military Men's 06-4096-04-007 Hanowa Chronograph Sealander ...

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