All of the above are true.
A is correct, because, well. We can’t see atoms directly, at least not with our current levels of technology.
B is correct because a model is a representation of something by nature.
C is correct because our knowledge of the atom is still growing, and as we still don’t know about some future atomic developments, it’s called a model so that there’s still flexible room for new discoveries.
Hope this helps!
plays the role in skeletal muscle movement
A(n) Watershed is an area of land that is covered or saturated with water for at least part of the year. (Mark me as Brainiest! Give thanks! And friend me for further questions!) <3
Milk,meat,fish,poultry,eggs,soy,legumes, etc...