What has allowed homosapiens to survive in different biomes?

Was american neutrality between september 1939 and december 1941 a tragic mistake

Historians are concerned with the accuracy of their writings and readings but are also aware of the inability of authors to know every angle of every story biases, perspectives, beliefs, and a variety of other differences history being told by one person at a time no one being totally accurate, as hard as we try really need on this, and you^^

Moral principles is what ? a. appreciation b. tariff c. fiscal d. ethics