The modern-day group of vertebrates that bridges the evolutionary gap between land-dwelling and water-dwelling organisms is:

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Amphibians are the modern-day group of vertebrates that bridge the evolutionary gap between land-dwelling and water-dwelling organisms. They are able to live both on land and in water, and share characteristics of both groups, such as having lungs as well as gills, and undergoing metamorphosis from a water-dwelling larval form to a land-dwelling adult form. Fish, reptiles, whales and dolphins, and aquatic birds are not specifically known for bridging this evolutionary gap.

The Modern-Day Group of Vertebrates That Bridges the Evolutionary Gap