Yes, they are close related, but reptiles tend to have scales and amphibians tend to have smooth skin (mostly on tropical amphibians) and even slimy skin.
No, dinosaurs are more closely related to reptiles than amphibians. Both dinosaurs and reptiles belong to the group called diapsids, which are characterized by having two openings in the skull behind the eye socket. Amphibians, on the other hand, belong to a different group called tetrapods.
Reptiles
Amphibians and avians are the most closely related species to reptiles.
Neither...They were reptiles. dinosaurs were nether amphibians or mammals they were all reptiles, though they are more closely related to birds.
They are generally considered reptiles, though some think they should have their own class.
Birds. Reptiles are also vertebrates.
Reptiles
Reptiles are more closely related to mammals.
Mammals are not closely related to reptiles
Dinosaurs are more closely related to mammals. Both mammals and dinosaurs share a reptilian ancestor that they don't share with amphibians.
Reptiles
Phylum Chordata: Subphylum Cephalochordata and Urochordata along with the subphylum Craniata