Select the following phylum that includes animals that are unsegmented, acoelomate, and have a digestive cavity with a single opening.  

A.  Annelida
B.  Platyhelminthes
C.  Nematoda
D.  Cnidaria
E.  Rotifera


B.  Platyhelminthes

Biology & Microbiology

You might also like to view...

____ asteroids appear to have nickel-iron compositions and may be the cores of broken asteroids

a. S-type b. M-type c. C-type

Biology & Microbiology

Which greenhouse gas is released by bacteria engaged in anaerobic metabolism?

a. nitrous oxide b. carbon dioxide c. methane d. ozone

Biology & Microbiology

dentical twins result from a single fertilization to form a zygote, which then clones itself.

a. true b. false

Biology & Microbiology

Which hypersensitivity disorder is the result of cell-mediated response?

A) type I B) type II C) type III D) type IV E) both type I and II

Biology & Microbiology