One of the earliest atomic models was suggested by john dalton in the early 1800s

John Dalton was an English Chemist (1766 - 1844) who focused on the model of the atom. Dalton proved that matter is made up of tiny particles, called atoms, and that the atoms cannot be divided into smaller pieces and cannot be destroyed. Other thing that Dalton proves was that atoms from the same element are same and that different element can be combined and form compounds.

Search on internet it may you

It's either -limiting factors or -scarce resources but i'd go with my first answer since the food and water are abundant they really aren't scarce