What type of mammal is a manatee is it a monotreme, marsupial or a placental

Which mantle is under the crust the upper mantle or the lower mantle i think it's upper let me know if i'm right

Ascientist discovers a new body between the orbit of neptune and the kuiper belt. the object is round and travels in an orbit around neptune with other space objects. the scientist claims that she has found a new dwarf planet. where is the scientist’s error?

Name the types of burns one can get and which structures of the integument are damaged