The similar biochemical structure of cytochrome C in ground finches and in tree finches indicates that they are evolved from a common ancestor. The evolution of finches into ground finches and tree finches occurs due to their environmental conditions which compel them to adopt certain physical features and behaviour that helps them in obtaining food and survival in their environment.
Most cell types are very permeable to water. an exception is cells of the distal nephron, which can be either impermeable or permeable, depending upon the absence or presence of aquaporins.
