text: These adapted traits are a very small component of the Homo sapiens genome , but include various characteristics such as skin color and nose form , in addition to internal characteristics such as the ability to breathe more efficiently at high altitudes .
simplified: These adapted traits are a very small component of the Homo sapiens genome and include such outward `` racial '' characteristics as skin color and nose form in addition to internal characteristics such as the ability to breathe more efficiently in high altitudes .