Which type of software coordinates the hardware and software of a computer to work efficiently and productively?
a. operating system
b. word processor
c. hardware drive
d. cpu

A. the operating system handles the I/O devices with the cpu, :)

Css3 is the latest evolution of the cascading style sheets language and aims at extending css2.1. it brings a lot of new features and additions, like rounded corners, shadows, gradients, transitions or animations, as well as new layouts like multi-columns, flexible box or grid layouts.credits to medium for making this answer credits to google for copying this answercredits to me for putting this answer on your question