Probably the Biosphere: where things live and grow
Answer:
they can naturally interbreed to produce a fertile offspring
Newborns receive a single injection of vitamin K at birth due to the fact that the newborns don't have enough bacteria to make vitamin K.
Vitamin K at birth helps the blood to clot and prevents serious bleeding. In newborns, vitamin K injections can prevent a now rare, but potentially fatal, bleeding disorder called 'vitamin K deficiency bleeding' also known as 'hemorrhagic disease of the newborn'.
You would have .3 of a chromosome for each new cell