Which of these characteristics added most to vertebrate success in relatively dr

Author Question: Which of these characteristics added most to vertebrate success in relatively dr (Read 635 times)

federox

Sr. Member
Posts: 308

on: Aug 8, 2013

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

theo

Hero Member
Posts: 698

Reply #1 on: Aug 10, 2013

Answer has to be A, 100%

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