The increase or decrease in the number of a particular organism in a food chain will affect the balance of the food chain thereby the balance of the ecosystem. Justify this statement with an example.

It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on

The correct answer is amu.