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They have streamlined bodies and two limbs that are modified into flippers

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which is characterized by tools made out of stone flakes

Hungary 1964 Space Research Complete Set of 8 Stamps Mint NH Nobel Prizes They have streamlined bodies andHungary 1964 Space Research Complete Set of 8 Stamps Mint NH Space is the boundless three dimensional extent in which objects and events have relative position and direction. Physical space is often conceived in three linear dimensions, although modern physicists usually consider it, with time, to be part of a boundless four dimensional continuum known as spacetime. The concept of space is considered to be of fundamental importance to an understanding