It's non foliated. Those are the floors that are commonly used like marble, or quartz. They look smoother and nicer.
Stabilizing selection is the correct answer. It decrease the amount of biodiversity on earth.
They should rely less on sight because the deeper you go down the less sunlight the reaches down because it refracts and gets dispersed. So it could be the middle of the day and it would look like the middle of the night down there.
The number of cytosine in a DNA molecule equals the number of guanine.