Answer: D) None of the above
Explanation: The subschema differs from the schema in that one denotes the appearance of data in the Database Base Management System (DBMS) while the subschema which is also referred to as the external schema is that subset of the schema is visible or relevant to the user. Thus, It is the view of the database which is visible to an application program. Virtual tables in a database usually represents an object structures like a table which is the result of running certain database commands or functions such as the create table, view, select and so on. Virtual tables are not stored directly in database files.
Answer: Renaissance
Explanation:
The Renaissance literally means “rebirth”. The Renaissance changed the world. You might even say it created all of what we now know as modern life.
Answer:
Correct answer is The Ural Mountains.
Explanation:
The Caspian Sea is not correct answer as sea is marked with blue color.
The Sayan Mountains are more to the east, closer to the border with Mongolia.
The Caucasus mountains are between Caspian and Black Sea and that also is not correct.
Therefore, the only correct answer is Ural, as this mountains are also natural border between Europe and Asia.
The percent is C.)75%
Hope This Helps.