Evidence for the widespread use of language by humans during the Paleolithic includes: Choose 1
Choose 1

A
Various written inscriptions found at Paleolithic sites

B
Long-distance travel and trade, and the organization of complex social and cultural structures

C
The ability to hunt animals for food

Social darwinism refers to the the theory that people who succeed in our economic system will one day out compete those who fail. one day the rich will out succeed the poor so we'll that there will eventually be no more poor

Slave labor.  slave labor was an essential part of the economy of spanish polish colonies.

True blindness may be caused by trauma to the eye, severe conjunctivitis due to  ibr (infectious bovine rhinoceros) or pink eye or other infections, leptospirosis, lead poisoning, selenium toxicity, fungal infections, vitamin a  deficiencies, rabies, vitamin b12 deficiency, neoplastic of the orbit or  conjunctiva, cataracts, congenital malformations, etc.