This one can be tricky, because your are changing the appearance of the substance. But here, you aren't changing its chemical form, so its a physical change. Even though you can't bring the pencil to its original beginning, its still a physical change.
Answer: Physical change.
Blood, flowers, bacteria, and skin
First blank space is endocrine system and the second blank is hormones
Answer:
The atomic number of phosphorus is 15. It has zero charge because it has 15 electrons.
The answer to your question is
![\boxed{\bf Enzymes}](https://tex.z-dn.net/?f=%5Cboxed%7B%5Cbf%20Enzymes%7D)
![\bf Explanation:](https://tex.z-dn.net/?f=%5Cbf%20Explanation%3A)
Enzymes help break down carbohydrates, fats, and proteins.
I hope this helps!