<span>A. The nebula contracts and shrinks instead of expanding
</span><span>Nebula is the cloud of interstellar dust and gas that forms a star. It is collborately shaped during colliding and collapsing of the interstellar mediums this is influenced by the gravitational attraction of the atoms and particles in the entites. Hence, there are three types of nebular namely, are classical nebula, diffuse nebula, planetary nebular and supernova remnants.</span>
Answer:
Cancer cells have nothing to stop them and they keep multiplying without a purpose with nothing to stop them
Explanation:
One type of atom
a pure substance
B, because all have similarities, not just some
