heart, or soul? hmm.
I like the line bound by life’s signature spine it’s very descriptive and you needed something to rhyme with time!

Venomous treat—like eating a S. American tree frog. lol tasty death mmmm.

oooo i think i like soul better

i’m all over Sour venomous treat!!!

Human nature, perhaps? Are we essentially good or evil? Lots of possible meanings here, like a good poem should have.