The following questions refer to the description below.
While on an intersession course in tropical ecology, Kris pulls a large, snakelike organism from a burrow (the class was granted a collecting permit). The 1-m-long organism has smooth skin, which appears to be segmented. It has two tiny eyes that are hard to see because they seem to be covered by skin. Kris brings it back to the lab at the field station, where it is a source of puzzlement to the class. Kris says that it is a giant oligochaete worm; Shaun suggests it is a legless amphibian; Kelly proposes it belongs to a snake species that is purely fossorial (lives in a burrow).
-Which one of these, if found, should clear up any remaining doubt as to the identity of the organism?
A) vestigial pelvic girdle
B) blood vessels carrying oxygenated blood from both the skin and the functional lung to the heart
C) closed circulatory system
D) ability to produce toxins from glands located on the skin, or that empty into the mouth
E) two-chambered heart

Question

Quizplus · Accepted Answer

Blood vessels carrying oxygenated blood from both the skin and the functional lung to the heart would indicate that the organism is an amphibian, as this is a characteristic unique to this group. This would eliminate the possibility of it being a giant oligochaete worm or a snake species that is purely fossorial.

The Following Questions Refer to the Description Below