Which characteristic is shared by cnidarians and flatworms?

A) dorsoventrally flattened bodies
B) radial symmetry
C) a digestive system with a single opening
D) a distinct head


C

Biology & Microbiology

You might also like to view...

Organisms that have nutritional needs that are relatively complex and require extra media components to be used for growth are called:

a. fastidious. b. capnophiles. c. neutrophils. d. halophiles.

Biology & Microbiology

Walking through the botanical garden with a friend, you spy a rare and beautiful variety of Hosta. "Oh I would love to have one of those!" you exclaim. "But they cost a king's ransom." Your friend smiles, snips off a tiny piece of the shoot, and says, "I'll grow you one. I'll just take it back to lab and..." 

Ranking Questions __  "wait for somatic embryos to form..." __  "grow up a callus..." __  "culture an individual plantlet for you..." __  "use enzymes to break down the cell walls..."

Biology & Microbiology

Studies have determined that ____ is not responsible for the cyclical rise and fall of arctic hare and lynx populations

a. predation b. a limited food supply for hares c. predation by other mammals d. intraspecies competition e. disease

Biology & Microbiology

Which reaction is the aerobic respiration of glucose?

a. C6H12O6 + 6 H2O ? 6 CO2 + 12 H2 + energy b. C4H12O4 + 2 H2O + 6 CO2 ? 6 O2 + ATP + energy c. C4H12O4 + 12 O2 + 6 H2O ? 6 CO2 + ATP + energy d. C6H12O6 + 6 O2 + 6 H2O ? 6 CO2 + 12 H2O + energy e. C4H12O2 + 6 O2 + ATP ? 6 CO2 + 12 H2O + energy

Biology & Microbiology