Match each generation of computers with its features.
used vacuum tubes
used transistors
used integrated circui
second-generation computers
third-generation computers
first-generation computers

answer: are there any

explanation:

social contract theory, nearly as old as philosophy itself, is the view that persons' moral and/or political obligations are dependent upon a contract or agreement among them to form the society in which they liv

c. had saved colonel cresap's family from attack by other native americans.