Difference between block and control section in system software

What is the basic difference between an analog communication system and a digital communication system?

What is difference between tissue and tissue system?

The potential difference between points A and B in a section of a circuit shown is

The potential difference between points A and B , in a section of a circuit shown in

What is the difference between an open system and a closed system?

Give any one difference between FAX and e-mail systems of communication.

Give any one difference between FAX and e-mail systems of communication.

The pie chart given below shows the number of students in 6 different sections. The total number of students is 1800. What is the difference between the number of students in section F to the number of students in section C?