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:necesitas puntos para hablar en privado
Explanation:
The answer is the urals and the caucasus mountains
Your best probable answer would be B. because tectonic plates are pretty much the reason why Central America has over a dozen mountains.
Answer:
Biomes play a critical role in the understanding of ecology because they help scientists study not only a specific plant or animal but also the role it plays in its community and the characteristics that it has developed to live in its environment.
Aquatic biomes are probably the most important of all the biomes. Their medium, water, is a major natural resource. Water is the basis of life, it supports life, and countless species live in it for all or part of their lives. Freshwater biomes supply us with our drinking water and water for crop irrigation.
Explanation:
