A valence electron

In which domain (main branch on the tree of life) are humans classified? 

Which of the following four elements are the most abundant in living organisms? (Choose all that apply.)

 When you define a table’s primary key, the DBMS automatically creates a(n) _____ index on the primary key column(s) you declared.

 The one-to-many (1:M) relationship is easily implemented in the relational model by putting the _________of the “1” side in the table of the “many” side as a ________.

 A(n) _____ index is an index in which the index key can have only one pointer value (row) associated with it.

 Management wants to see a database design that is logical in nature. It must be easy to identify where and how each table is related to one another. How can a database designer achieve this design concept before the next meeting?

 _____ returns only the attributes requested, in the order in which they are requested.

 In an entity relationship diagram with objects EMPLOYEE, DEPENDENT, CUSTOMER and PRODUCT, which of the following would be the most appropriate example of a derived entity?

Comel, a student, takes four classes with her group of best friends. She sits in the front row with two friends and the others sit behind them. What type of relationship would Comel’s situation be described as?