Answer:
Infinite / infinite.
Step-by-step explanation:
The atomist beliefe, or atomism theory, as the example describes, consists of an infinite number of minute particles, rather simple and immutable and too small to be looked at. So, given that they are infinite, every form in nature is formed by this particles that, given they extent, have changes.
In other words, everything is formed by this particles, this atoms. Their differences can be observed and, therefore, explain how is it possible to have simmilar and different things in nature.