Fossil evidence indicates that some dinosaurs had feathers. if birds are indeed descended from dinosaurs, feathers are what kind of character? -polyphyletic character -shared ancestral character -shared derived character -analogous character -cladistic character

answer; ///(b) it is composed of four protein chains and four heme groups;

as many times as you want

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).