What is the difference between food web and food chain and what do they have in common?

A food web is a system of interlocking and interdependent food chains.

A food chain is a hierarchical series of organisms each dependent on the next as a source of food.

Basically, the difference of the two is that a food web contains multiple different species in the same level that eat the animal below it's status. A food chain is one after the other.

b. is the answer hoped i        

a corroding iron, if that's one of your choices