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Wow, I didn't realize we had vestigal muscles in our ears!
Quote from: Jessica H on 20/04/2010 17:26:19Wow, I didn't realize we had vestigal muscles in our ears!Oh yes. Some people can wiggle their ears quite well. Being a more advanced form of the species, I don't have that ability.
We also have a tail hidden inside our body after birth. And while in the womb the human embryo has gills.
Quote from: JimBob on 21/04/2010 00:47:21We also have a tail hidden inside our body after birth. And while in the womb the human embryo has gills.has this anything to do with the environment we are in?
Although structures usually called "vestigial" are largely or entirely functionless, a vestigial structure may retain lesser functions or develop minor new ones
As embryos men and women have similar tissues and body parts. If anything the embryo follows a 'female template'. That is why nipples are present in both sexes. It is the effect of the genes, the Y chromosome and the hormone testosterone that brings about the changes and masculinises the embryo. Testosterone promotes the growth of the penis and testicles. Because nipples are there before this process begins the nipples stay!