What unit of time on earth is based on the revolution of the earth around the sun?

The unit of time based on the revolution of the Earth around the Sun is called a Year.

The unit of time based on the Earth spinning around completely once on its own axis is called a Day.

Ifound this on google “according to the findings, a foramen magnum positioned toward the base of the skull is found not only in humans, but in other habitually bipedal mammals as well.” i hope this you for what your looking for