There are no examples, i'd love to answer it, but you have to either upload the examples or a picture of them
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.
I believe it would be the reptile kingdom!
B - energy flow from one tropic level to the next