For the earliest human societies, what was the best source of protein? *

Large hooved animals.

Explanation:

The best source of protein for earliest humans are the large hooved animals because they have a large amount of meat present in their body which is a big source of protein. Early humans need protein in large amount because protein has high amount of energy and these humans also need protein in large amount due to their hard working behavior which makes necessary the intake of protein in large amount in every meal.

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.

the answer is definitley b!