What Am I Riddles

Question: Although I am still, in families, I run. I continue to live on in a living one. As one continues to draw breath, I will not rust. However, when one stops drawing breath, I will become mere dust. What am I?

Question: We have what we did not find; what we did find we left behind.

[What do we have?]

Question: I have more shoes than anybody,
but less feet than everyone.
I am met in the morning,
but departed in the night.
I may shake as if I'm angry,
but I won't bite.

What am I?

Question: Not only a seat, it’s also a head - what is it?

Question: What's small like a mouse but protects like a lion?