"scientific" racism was used to justify negative attitudes toward both slaves and immigrants from (apex)

Scientific racism:

Scientific racism is a pseudo scientific belief based on experiential evidence so as to justify racism, racial superiority or racial inferiority.

Scientific racism became very much common from 1600's to the end of World War II whereas in mid 20th century scientific racism was heavily criticized as discredited.

There were many people who used to support this concept of scientific racism based upon the belief which was in existence and significance of such racial categories. People also believed in the hierarchy of superior and inferior races.

deists, human beings can know god only via reason and the observation of nature, but not by revelation or by supernatural manifestations

hope this

crop rotation kepy different plants in the soil instead of once constintly. when switching out plants you have different nutrients being absorbed at different speeds and different roots growing differently therfore the spoil and water flow have to adapt and carry fresh nutrients to carry the constant changes that were going on in the soil.