The Following Questions Refer to the Description Below

Multiple Choice

The following questions refer to the description below.
You and a friend were walking through a pet store looking at the different aquaria with fish. Most of the aquaria had fish that were healthy and colourful, but two tanks with many fish in them had fish with "fin and tail rot" caused by a pathogenic bacteria. You and your friend read that bacteria are found in most environments and that healthy fish are quite resistant to bacterial infections.

-A distinguishing feature of the organism in test tube 3 is

A) the requirement of 2 hosts to complete its life cycle.
B) absence of flagella.
C) that it is a major component of zooplankton.
D) walls are made of silica.
E) cilia used for feeding.