Food webs - transferring energy and matter from one level to another. here you see four food webs. one or more are incorrect. which food web(s) show the correct sequence of organisms, from start to top level consumer? a) c eliminate b) d c) b and c d) a and b

I do not know the choices but the bottom is the producer which are plants. Producers are not included in consumers because they produce their food instead of trying to eat it. 
Next comes herbivores which eat plants
third comes omnivores that eat plants and animals and last comes carnivores which eat plants.
(note: Some food chains have decomposes which are things that help break down dead plants and animals. This includes things like mushrooms and some microorganisms, and some worms.)

Pe = 1/2k(x)^2  and .05n/m = .05x10^-9m = x