What two democratic leaders constantly challenged president carter during his administration? •huey long•tip o'neill•john daley•russell longi searched everywhere on here for the answer before i realized that i had it in my notes, i'm basically just posting this 'question' so i can give the correct answer, the incorrect posts were too old for me to comment. the correct answer(**tip o'neill & russell long**

Which one of the following was not a reason for the emergence of the single-family peasant farm as the basic unit of agricultural production in the early middle ages? select one: a. the mounted soldier made warfare expensive, so many warriors became full-time farmers. b. the declining birthrate made it necessary for entire families to work in agricultural production. c. horses made it easier, although more expensive, for farmers to support themselves. d. it was more economically feasible for landowners to rent their land to farmers. e. villa owners could no longer purchase slaves.