Answer:
To regulate body activities (like growth and immunity) by sending chemical messages
Explanation:
I'm not 100% sure about this, but this seems most likely after a quick internet search.
I hope this helps, but you might want to double-check this.
The name of the leaf is a Black locust
No, because there is no oxygen.
Answer:
-4 is greater than -6 because it's closer to being a positive number than -6 is