Many chemicals are used to kill insects and protect plants. how could the removal of insects upset the balance of the ecosystem? a) the plants would rapidly increase in number. b) animals that eat the insects would die as well. c) the animals in the ecosystem would eat all the plants. d) insects from other regions would replace the killed insects.

It would be B) because since the insects aren’t their the animals that use to eat them will not be able to eat anything and die.

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