To be in the third normal form, a. each non-key column must depend only on the primary key b. each non-key column must not depend on the primary key c. each non-key column must contain repeating values d. all of the above

each non-key column must depend only on the primary key

each non key column must depend only on the primary key

Explanation:

To be in the third normal form, each non-key column must depend only on the primary key that is, it must be splitted into smaller forms and first identify the smaller objects to see what separates them, The primary key is a column, or set of columns, that allows each row in the table to be uniquely identified, no two rows in a table with a primary key can have the same primary key value.

6.3%

explanation:

the acceptance rate for yale university is 6.3%. this means that only 6 percent of people who apply actually get accepted!

two jet streams that directly affect the formation of weather in the continental part are a polar jet and a subtropical jet. they are responsible for the transportation of weather systems, which directly affect people. the polar front is the boundary between cold air from the north pole and warmer equatorial air. both the polar jet and the subtropical jet blow from the west to the east, and follow the boundary between cold and warm air.

the strongest jet streams are polar jets, while subtropical jets are somewhat weaker.

the right answer is c. the polar jet stream is generaly stronger than the subtropical jet stream.