Question

During crucial periods of human evolution, the Pleistocene was characterized by

A. aridity, then humidity.

B.massive glaciation, then warm interglacials.

C.high humidity.

D. glaciation, then aridity.

Answer 1

B. Massive glacitation, than warm interglacials

The Pleistocene often refered to as Ice age, lasted from about 2,580 million to 11,700 years ago, which was charecterized by repeated glaciation ( state of being covered by glaciers or ice sheets.). The growth of large ice sheets, ice caps, and long valley glaciers was among the most significant events of the Pleistocene.The Pleistocene has been characterized by significant temperature variations on time scales of 40,000 to 100,000 years, and corresponding expansion and contraction of ice sheets, these occured due to changes in earths' orbital parameters.Pleistocene was also characterized by the presence of distinctive large land mammals and birds, The Pleistocene also saw the evolution and expansion of Homo sapiens, (our species) and by the close of the Pleistocene, humans had spread through most of the world.