Contemporary Issues in Biology Final ~ TCU, Sawey Questions & 100% Verified Answers | Latest Update | Already Graded A+

how long have homo-sapiens been on earth ☑: thought to be 200,000 years, starting in ethiopia mutation ☑: change in nucleotide in the base of DNA; not all harmful; passed down in generations of that descent when did humans establish themselves worldwide ☑: 12,000 years ago; before humans and agriculture coincided how did humans live before agriculture ☑: used tools (needles, spears, clothes) and lived in small groups spread out of large areas of land when were large cities and civilizations possible ☑: after we domesticated wild plants and animals and developed agriculture systems EXCELLENCE 2 domesticated plant or animal ☑: modified from its wild ancestors for its use by humans early domestication was unintentional ☑: seeds brought back by hunter gatherers foraging in the wild grew by accident in large latrines and garbage dumps later domestication was conscious ☑: scientists planted many different seeds, selected the best progeny and planted their seeds domestic crops ☑: selected for maximum productivity and had little natural pest resistance pest attack problems ☑: due to not selecting pest resistance during domestication DDT ☑: invented as a pesticide but then pests became resistant (natural selection) --> selection pressure towards pesticides, invented in the 1940s biomagnificatio