Answer:
D. A bicycle rusting.
Explanation:
A. is incorrect because tearing a piece of paper is a physical change, not a chemical change.
B. is incorrect because we are just heating up the object. That only changes how fast the particles are moving and the change in state of matter.
C. is incorrect because we are adding heat to change a state of matter (from solid to liquid) and it is a physical change.
Therefore, only D. is the correct answer. Iron rusts, and when it does, it chemically changes into an iron oxide (rust).
Fossil fuel was non existent 2.5 billion years ago
Well to be fair no matter what happens, a will always happen no matter how wholly fold is chewed. However because chime is the byproduct of chewing and saliva. Your body must be able to break down the food into a smaller and easy to absorb form so if you can't do it with the mouth, the stomach is just going to have to do the job.
So "D" is the correct answer
