No visible flesh,
Nor blood,
Nor bone.
But within time,
I will walk alone.
What am I?

(A bird's egg)

I am just two and two, I am hot, I am cold,
I'm happy to give and take if you're bold.
I'm a gift beyond measure, a matter of course,
But not often present if there's a divorce.
What am I?

(A kiss)

Walk on us living,
We won't even mumble.
Walk on us dead,
We'll mutter and grumble.
What are we?

(Leaves on the ground)