Marshall wants to remove a tree stump from the ground. To do this he puts one end of a long beam under the stump and puts all his weight on the other end. His weight is just enough to lift the stump. The stump weighs 400 N. Marshall weighs 250. What is the mechanical advantage of the long beam Marshall is using?

what's the question ?

the flagellates share a facultative mutualist association with termites. mutualism is a biological interaction between individuals of different species, where both benefit from each other. this is called cooperation and it differs from other interactions such as cases of exploitation, such as parasitism, predation. in this interaction called association, both species cooperate and benefit.