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 of these characteristics added most to vertebrate success in relatively dry environments?
A)the amniotic egg
B)the ability to maintain a constant body temperature
C)two pairs of appendages
D)claws
E)a four-chambered heart

Question

Quizplus · Accepted Answer

The amniotic egg allowed for vertebrates to reproduce and develop in dry environments, without the need for external water sources. This was a major evolutionary advantage and contributed to the success of many vertebrate species. The other characteristics listed may also contribute to success in particular environments, but the amniotic egg is the most significant for dry environments specifically.

The Following Questions Refer to the Description Below