Number 2 but I am not sure sorry dude
Explanation:
A model is used to help scientists visualise things that they cannot actually see. It can be thought of as a thinking tool, to help form explanations. Models are useful simplifications to aid understanding. ... It can then be used to explain further phenomena and to make predictions of future behaviour.
It is found in the understory or the lower canopy
Answer:
the proton is most likely the answer let me know if I'm wrong or right
