Which phrase best defines a food chain? a the ecological term applied to plants and other photosynthetic organisms that produce glucose 


b organisms that eat other organisms


 c the sum of all actual feeding relationships in an ecosystem


 d a single pathway of feeding in an ecosystem




Ahuge (essentially infinite) horizontal nonconducting sheet 10.0 cm thick has charge uniformly spread over both faces. the upper face carries +95.0 nc/m2 while the lower face carries -25.0 nc/ m2. what is the magnitude of the electric field at a point within the sheet 2.00 cm below the upper face? (ε0 = 8.85 × 10-12 c2/n · m2)