Fundamentally, refers to the ability of a subject and an object to interact.

The correct word for the blank space is: access.

Explanation:

Access Control System (ACS) is a programming framework that enables or restricts users to access a server's features and details. ACS is used to protect confidential data and to ensure that authorized users use the servers to avoid malfunctions. Letting subjects and objects communicate appropriately is one of the basic principles of ACS.

the median of the data is 4.

step-by-step explanation:

the median means the middle number of a given number.

to decide which one is the median, arrange in ascending or descending order. but sometimes, you may find two(2) number in the middle, but it's easy, just add them together and divide by 2.

so,   determine the median of the data. 2, 3, 3, 4, 5, 7, 9

it is already arranged, count 3 times forward and 3 backward and the one left is your answer.

2,3,3,4,5,7,9

our answer is 4.

hope this !

  b.

there are isolated pockets of farming, generally around rivers and oases, which are used for irrigation.