Answer:
As soft as silk, as white as milk, as bitter as gall, a thick green wall, and a green coat covers me all.
Without this, eating food and Steven Spielberg's career would be very different.
Being able to interpret the letters on this screen proves that you have this quality.
Reaching stiffly for the sky, I bare my fingers when its cold. In warmth I wear an emerald glove and in between I dress in gold.
My teeth are sharp, my back is straight, to cut things up it is my fate.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?