I'm a paradox in a shell, formed without life, yet life may dwell. Break me, and a meal appears, or potential futures become clear. What am I?

Most people use me every day. I may present in many colours and shapes. I’m usually accompanied by a friend with a similar shape, depending how I’m used, but sometimes I stand alone. From food to trinkets I’m a vessel that doesn’t float.

I am the cockerel that never crows, a letter or two for every way the wind blows.

Hang me high up in the air, to carry voices here and there. Even though I'm found on snitches, is not why they dig me ditches. Trappers use me to catch hares, This is why I'm used for snares. If the sign says electric, I will be wrapped in plastic

You and I are always together, Though you'll only see me in fair weather. I can take any shape, long or round, Yet I can never rise from the ground. What am I?