Dinosaurs came in different sizes, just as animals today are different sizes. There can be many animals larger than SOME dinosaurs.
Elephant
There is not a dinosaur that I know is living to this day but there are animals that have descended from the dinosaurs.
Not that we know of. A. Fragillimus was well over 196 feet long, even the longest animal living today, the blue whale, is only about 113 feet long.
There might be, but they've changed so much most people wouldn't recognize them. Probably the animal most dinosaur-like is the emu.
birds and alligators
Birds.
Yes and no. To explain, some dinosaurs were bigger than any other animal that lives today, except for the Blue Whale, which remains the largest (confirmed) animal to ever have lived. To further complicate the question, paleontologists have discovered a single bone, (not a full skeleton) that suggests there might have been a dinosaur that was even bigger than the Blue Whale, but with only a single bone the evidence in inconclusive.
cheyanne mondragon
elephant
The noun 'dinosaur' is a concrete noun, a word for a physical creature. Although there are no dinosaurs living today, there are many physical remains of those that were once alive.
Birds are a group of dinosaur. We know for certain that they are all around us. Therefor, it isn't even a question that dinosaurs are alive today.
the first reptile would be the alligator and crocadile they have been here dinosaur time and they are the oldest living reptiles alive today.
the same as today, the blue whale.