Answer:
the empirical limits of science define problems with observation, and thus are limits of human ability to inquire and answer questions about phenomena. These include topics such as infinity, the future and god.
I believe the answer is energy. Hope this helps. (ノ◕ヮ◕)ノ*:・゚✧
Settlers could purchase title to farmland in undeveloped west.
Microevolution is the answer