I’m carried but not heavy, I’m nailed yet feel no pain. Remove a D and I am an animal

With me, there shall be no incompleteness Traces I left behind are not signs of imperfect, but rather a mark of the past. They are not weaknesses, but the reason things exist until today.

I'm the seventh in a dozen that glow Removing my second letter leaves you with a primary trio Red strikes anyone who wants to see I might also be a name, one similar to a currency What am I?

I am born without breath and die without a sound. I hold what I cannot keep, yet vanish when I’m held too long. I cut without a blade, shine without fire, and fall without ever rising. What am I?

I guard the door without being a room. I feel the weather yet belong to the house. Guests pause on me, shoes linger on me, and I stand between inside and out. What am I?