“In lower animals, which lay their eggs in water, the developing embryo is nourished by yolk, absorbing oxygen from and discharging wastes directly into the water.” www.reference.com
Just as in Human Beings Feeding off oxygen from the Earth and discharging wastes directly into the Ocean or the Land…
The Earth… Our Embryo in which we Grow, protected from Space which can harm us…. will not last forever as we grow bigger….
8000 Pixels Square