Multiple choice Which of the following is/are not single-celled animal/s? Grasshopper Planaria Amoeba Both 1 and 2 Reveal answer Fill a bubble to check yourself D Correct answer Explanation Amoeba is a single-celled organism. Grasshoppers and planaria are multicellular animals, making option D the correct choice as it identifies that both 1 and 2 are not single-celled.