Please choose the correct answer to the question: An elephant is a multicellular organism that weighs about 200 pounds at birth and can grow to weigh as much as 15,000 pounds. What increases as the elephant grows into an adult?

Answer1: the size of each body cell Answer2: the number of cells in its body Answer3: the amount of energy in its cells Answer4: the collection of water in each cell

Answer format: answer1/answer2/answer3/answer4
Answer: answer2