How does an increase in reactant concentration affect the rate of reaction?

If the concentration of a dissolved reactant is increased, or the pressure of a reacting gas is increased:
1.the reactant particles become more crowded
2.there is a greater chance of the particles colliding
3.the rate of reaction increases

I’m not exactly sure what your trying to ask, but if it’s how an organelle is similar to a body system or a part a nucleus is like a in function. but i don’t fully understand what you’re trying to ask