Photosynthetic autotrophs are organisms that use light energy and carbon dioxide to make sugar and oxygen. aerobic heterotrophs, on the other hand, are organisms that use oxygen and organic carbon for energy, and release carbon dioxide as a waste product. earth's early atmosphere contained very little free oxygen. based on the information above, which of the following is most likely true?

(05.01 mc) west indian manatees are large aquatic mammals that live in rivers and near shore estuaries, especially in florida. they have two flexible front flippers with three or four toenails, similar to elephant toenails. though they lack hind limbs, manatees have vestigial pelvic bones, as shown in the diagram. manatee and elephant skeletons are shown side-by-side. the manatee, an aquatic animal, has a skeleton that has two large front limbs and two very tiny hind limb bones that do not form actual limbs. the elephant has four large limbs. which of the following answer choices best describes how evidence of the manatee toenails and pelvic bones supports the scientific theory of evolution of these animals? (1 point)