PHORID FLIES. If the flies are small, light brown to black, and have a rather jerky or erratic walking behavior when they are on a surface (they run in a zig-zag rather than a straight line) then they may be phorid flies. These are sometimes called sewer flies. They are similar in size to fruit flies, but the walking separates them, and they seem to be active at night, while fruit flies are not. Phorid flies usually have a direct connection to a broken sewer line (inside or outside the house). If these are the flies you have, it is best to get the sewer or septic tank system looked at
What is the main way that this passage is helpful to those most likely to read it?
Responses
A It describes all different kinds of insects, helping the curious reader to distinguish one from the other.It describes all different kinds of insects, helping the curious reader to distinguish one from the other.
B It elaborates upon the sort of pests that can be attracted by sewage line difficulties.It elaborates upon the sort of pests that can be attracted by sewage line difficulties.
C It details the mating and sleeping habits of various types of insects.It details the mating and sleeping habits of various types of insects.
D It helps to identify a particular kind of pest, in order to determine the underlying problem.