Answer:
The "X" or "Y" gene that determines whether you will be a boy or a girl is an example of a chromosome .
Explanation:
Crust
mantle
convection currents
outer core
inner core
I think you might be talking about GMO ( genetically modified organism)
The surface layer of the water freezes solid creating a barrier that insulates the ice below so that it keeps a steady temperature usually a few degrees above freezing (32 degrees).