HELP!! IT'S WORK 25+ POINTS AND ONLY HAVE 20 MINUTES LEFT!! Which of these are characteristics of reptiles? Check all that apply.
They undergo internal fertilization.
Their urine is concentrated.
They use their skin for gas exchange.
They have two-chambered hearts.
They are covered in scales.
They undergo internal fertilization. They are covered in scales.
(Their scales are too thick to be permeated by oxygen, their hearts are three-chambered, and their kidneys are unable to produce liquid urine more concentrated than their body fluid.)
