Your body systems work together to keep you alive. Each of these systems is made up of organs
with specific functions. The structure of these organs and the cells of which they are made make
them well suited to their function. An important function of your body systems is to supply your cells
with energy and nutrients, and to remove wastes that are produced, thats the best I
have.
Getting a cramp while swimming is the worst that could happen to us people. I think the best answer here is to relax, float and massage the cramped muscle because, if you try to keep swimming the muscle could tighten more and could get out of hand and could cause you to drown.
Organelles-cells-tissues-organs-organ system-organism
I'm not entirerly sure whether ANY of these statements could be considered untrue.
Socializing up to a certain extent could increase productivity, granted it would be done with work in mind.
B, C, D all are true as these are very commonplace things that can happen at the workplace, while not all are equally probable all of them could happen.
If one really is considered untrue, it most likely would be A.
