These are adaptations to life on land: amphibia were the first vertebrates to have these features.
(amphibia; were; the first vertebrates to have these features) Context(amphibia were,List([39, 52))):(These; are; adaptations to life on land)
amphibia were,List([39, 52))
amphibia These
were are
the first vertebrates to have these features
adaptations to life on land