Answer:
FROM.
Explanation:
UPDATE table
SET column=value,column1=value1,.....
WHERE condition;
In the UPDATE command given in the question FROM is optional because when using UPDATE we already mention the table name with update look at the syntax above.So there is no need to again mention the table name in FROM.All other three are required that is UPDATE,SET,WHERE.
Answer
program that, after being initially loaded into the computer by a boot program, manages all of the other application programs in a computer. The application programs make use of the operating system by making requests for services through a defined application program interface (API). In addition, users can interact directly with the operating system through a user interface such as a command line or a graphical user interface
Answer:
The number of nodes in a full binary tree of height 2 = 7
Explanation:
At each level k, of the full binary tree there are usually 
nodes.
So the full binary tree of height 2 has nodes= 
+ 
+ 
.
which is 7.
Did you forget the picture?
It's B.
As you go up, the air thins out, meaning it is less dense. Since there are less molecules that can transfer heat, the temperature is lower.
