Organ systems and Evolution

Evolution occurs in levels of population . Natural selection is one mechanism of evolution . It is a process that enables organisms to adapt to their environment by means of heritable characteristics

Darwin 's finches are termed as the symbol of evolution . Finches are species of Passerine birds . There are about 14 species of finches known today and most of them are found in Galapagos Island . To be specific thirteen species are found in Galapagos Island and only 1 in Cocos Island . These species are similar in most ways except for one characteristic which

is the shape and size of their beaks . These birds are sparrow sized birds with gray , brown or black feathers . They also have short and rounded wings and a rounded tail . Finches are generalized feeders but can be specialized feeders when little food is available

An evidence of evolution in Darwin 's finches is their varying size and shape of beaks . These finches came from a single species but by means of natural selection has developed specialized feeding structures . Each species has a different size and shape of beaks that best suits their need as each species differ in the types of food they eat during dry season or when less food is available . Some have crasping bills probing bills and grasping bills

Camarhynchus pallidus is one of the many species if Darwin 's finches It belongs to the Embirizidae family . These species can be found in Galapagos Island . The size ranges f5rom ten to twenty centimeters . It...