Derived from the inner cells of a human blastocysts , a very early human embryo.
At the blastocyst stage, five to 10 days after fertilization,
the embryo is a cluster of 100-200 cells
D, they need to be able to absorb and keep water to prevent drying out
I would say keep the soil from eroding and doesn't let it get dried out so fast.
With increase in altitude atm pressure decreases... :)
