False. When using the 40X objective, you should not use the coarse adjustment knob.
Explanation:
The coarse adjustment knob is used with lower power objectives if used at high powers the lens may get broken and also it would be difficult to attain desired focus. The coarse adjustment knob is used to attain the focus of the object by maintaining the distance between the object and the lens. This is the rough focus knob of the microscope and the focus of the object moves very quickly when using coarse adjustment.
2nd answer ecological succession .. don't know about the first one
Answer:
At a point directly in the middle between the bottom and when the car stops. This is because this is the perfect balance point between kinetic energy and potential energy.
Explanation:
When it is in the middle it has the most potential to move