In vertebrate animals, the same organ in different species often have different structures. For example, the heart of a fish has
two chambers while the heart of a mammal has four chambers. What is an explanation for these differences in organ structure? A) reproductive differences B) differences in the size of the animals C) mutation of the genes of the organisms D) adaptation of organisms to their environments
Name the state of matter of each layer of the earth... The crust and the inner core are solid, whereas the outer core and inner mantle are liquid. The outer mantle is semi solid.
