My favorite evolutionary fact is how the sperm duct is wrapped around the bladder and pubic bone in humans that have them, forcing sperm to take a long path through the body. It was less of a deal when our ancestors walked on 4 legs, but now they’re wrapped around the ureter which connects the kidneys and the bladder.
My favorite evolutionary fact is how the sperm duct is wrapped around the bladder and pubic bone in humans that have them, forcing sperm to take a long path through the body. It was less of a deal when our ancestors walked on 4 legs, but now they’re wrapped around the ureter which connects the kidneys and the bladder.