What are hieroglyphics, oracle bones ,sanskrit ,cuneiform all examples of?

Sole i will mark brainlist to who answer

How does the concept of competition relate to the arms race between the us and the soviet union during the cold war?

How did the completion of the transcontinental railroad change the lives of american citizens? a-it increased the wealth of all americans and enabled them to travel more.b-it made cross-country travel too expensive for ordinary americans.c-it decreased the safety of americans who moved to settle the plains.d-it shortened travel time between the east and west for all americans.