What Am I Riddles

Question: You bury me when I'm alive,
and dig me up only when I die.

What am I?

Question: Without me you will not live. Without me you will not love. Without me you have no courage,what am i?

Question: My eye is dark,
and my mane is yellow.
You man see me at the mart,
and I'm probably taller than you fellow.

What am I?

Question: What's cheaper than gold, yet more valuable.Hard to find, but easy to loose

Question: I am often known as a symbol/mark, and can be used in a trend. I am created when two paths meet, but separate at the end. What am I?