Pressure and heat is the two forces
Answer:
Gregor Mendel
Explanation:
He was the first to describe how characteristics are passed down from generation to generation.
Your answer will be Physical evidence it give people the chance when they find something that's a important like a weapon,or hair it gives experts the chance to see if they can figure out what happen so they can catch the guy who caused it to happen.
So your answer is Physical Evidence.
Answer:by moving against each other causing the surfy to change over time
Explanation: