The Following Sequence of Organisms Represents All of the Following $\rightarrow$

The following sequence of organisms represents all of the following except trees $\rightarrow$ insects $\rightarrow$ spiders $\rightarrow$ frogs $\rightarrow$ fish $\rightarrow$ human

A) a food chain.
B) a food web.
C) the flow of energy through the community.
D) the flow of nutrients through the community.