Based on the fossil record, ____ evolved about 1.8 million years ago and made fairly sophisticated tools, including the

hand axe.



a. Homo habilis
b. Homo erectus
c. Australopithecus africanus
d. Australopithecus afarensis
e. Homo neanderthalensis


ANSWER: b

Biology & Microbiology

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The group of animals with an efficient respiratory system, in that there is no "stale air" after exhalation, is the:

a. amphibians b. birds c. mammals d. reptiles e. fish

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The thymus plays an important role in ____

a. secretion of thyroxine b. immune function c. adrenal function d. production of testosterone e. sleep-wake cycles

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According to Bridges's proposal, exceptional phenotypes and unusual karyotypes were the result of rare mistakes in meiosis caused by the failure of X chromosomes to separate properly in either the first or second meiotic division in females

What term is used in referring to this phenomenon?

Biology & Microbiology