what key trait of life developed with the emergence of multicellular organism, the third threshold in the evolution of life? a. metabolism b. adaptation c. homeostasis  d. reproduction

Which sequence of events in human evolution is most widely accepted? A.   increase in brain size, tool-use, bipedalism, movement out of Africa B.   tool-use, bipedalism, increase in brain size, use of fire C.   bipedalism, increase in brain size, tool-use D.   tool-use, use of fire, increase in brain size E.   bipedalism, tool-use, increase in brain size How do we know that the footprints discovered by Mary Leakey’s team at the site of Laetoli are those of bipedal hominids?     A.   There is no evidence of a divergent big toe B.   The stride width and length were similar to modern humans C.   There is evidence of an arch D.   all of these E.   A and C only   Which of the following were the first to arrive to the Western Hemisphere? A.   Modern Homo sapiens B.   Archaic Homo sapiens C.   Homo erectus D.   Neanderthals

Which characteristic is shared by prokaryotes and eukaryotes? a. cytoskeleton b. nuclear envelope c. DNA-based genome d. mitochondria

Which adaptation of homeostasic mechanisms supports the idea of common ancestry within vertebrates?      A. hormone secretion upon stimulation of hypothalamus     b. housing of respiratory surfaces within the body     c. presence of hemoglobin within the blood     d. initiation of hypersensitive responses upon recognition of a foreign pathogen