The sled with a rough metal bottom would take more force to move over ice, because the rough surface would increase friction and the force needed.
20.
They told me that my answer was too short so I'm just adding this on, don't mind me.
Isotopes of an element are defined has that has same atomic number but different mass number mean they have different number of neutrons
so the statement that best describe a similarity is
<span> same atomic number; different mass number
</span>so correct option is C
hope it helps
The answer is that it is a big tooth
