Which organism weighs the most among the following?

The blue whale is the correct answer because it is not only the largest animal currently alive but also the largest known to have ever existed on Earth. Adult blue whales can weigh up to 200 tons or more, depending on their size and age. Their weight is primarily due to their massive body size, which can reach lengths of over 100 feet.

In comparison, while great white sharks and elephants are also large animals, they do not come close to matching the weight of a blue whale. Great white sharks can weigh around 2,400 pounds at most, and adult elephants typically weigh between 5,000 to 14,000 pounds, depending on the species. Giraffes, although tall and impressive in stature, weigh significantly less, usually around 1,600 pounds for adults.

Therefore, the immense size and weight of blue whales make them the standout choice among these organisms.