Because they are made upf of different types of dit and rock. there location may affect this as well. if one was in a cave they might be larger. and a water source, like a lake, or rivier, they might be smaller. this is why usually around the bottom of lakes and oceans, you would find sand, not boulders.
Answer:
I think the 1 & 2 is a but idrk the rest
Substitution is never a framshift mutation
