Explanation

Cooperation is the action or process of working together to the same end.

"they worked in close cooperation with the British Tourist Authority" 

Explanation

What Is an Effectively Managed Classroom-An effectively managed classroom is one that runs smoothly, with minimal confusion and downtime, and maximizes opportunities for student learning.

Explanation

Major forms of pollution include air pollution, light pollution, noise pollution, plastic pollution, soil contamination, radioactive contamination, thermal pollution,and water pollution.

Explanation

Pulley is a wheel with a grooved rim around which a cord passes, which acts to change the direction of a force applied to the cord and is used to raise heavy weights.

Explanation

German Inventor Karl von Drais invent bicycle.

His machine, known as the "swiftwalker," hit the road in 1817.