Scientists can understand and learn about evolution by studying 1:nomadic history 2:fossils 3:cellular formation . However , whole and intact specimens are hard to come by. To study these specimens, scientists use technologies such as 1: 3-D Printers 2: 3-D Cameras 3: Microscopes

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Germany began the 1930s with an extremely weak economy, but the nazis soon established adictatorship; as a result, the government could pursue militaristic policies without fear of opposition. bycontrast, japan entered the 1930s with a relatively strong economy but a divided government; manypowerful japanese officials opposed military expansion.