Xavier is working on classifying animals into groups based on their physical characteristics. He decides the animal shown in the image is a vertebrate and has a backbone. What other classification would Xavier most likely use to help him?
frog
© sdominick / iStock 2018
If it is born with gills and lungs, to decide if it is a mammal
If it lives on land or in the water, to decide if it is a reptile
If it has scales and gives birth or lays eggs, to decide if it is an amphibian
Whether it has fur or hair, to decide if it is a reptile
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