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

its main object was the establishment of "settlement houses" in poor urban areas, in which volunteer middle-class "settlement workers" would live, hoping to share knowledge and culture with, and alleviate the poverty of, their low-income neighbors.

the graph shows the spread of railways in the 1800s.

based on the graph, the conclusion that can be drawn about germany is answer d)   by 1880, germany had more rail lines than great britain and russia.

wheres the studying charts

explanation: