glucose, water, carbon dioxide, and oxygen.
The blue whale is the largest animal alive on Earth today, although the exact maximum size is something of a moving target in the literature. This prodigious species is thought to be capable of reaching 110 feet in length, and the largest scientifically verified individuals on record are 89 to 98 feet long.
The answer is certainly a dinosaur, and certainly a sauropod. Depending on how accurate current estimates are, a sauropod might even be the largest creature ever to have existed, perhaps beating the Blue Whale's record of 103 feet and weight of +175 tons (although some say 110 feet). Please understand that for the reasons detailed, this is not an exact science!