The kind of muscle contraction that occurs when you try to lift a box but it's to heavy and it can't be moved from the floor is called: Isometric Contraction.
Explanation:
Isometric contraction consists of having a muscle activated but to maintain it at a constant length, instead of shorten or lengthen it.
The correct answer for the question above is letter a. A farmer is trying to improve his crop yields by using a new kind of <span>fertilizer. It describes best the basic science research because it aims to make the the scientific theories better.</span>
