Ascientist finds a fossil that she thinks might make a good index fossil. which characteristics does this fossil most likely have? check all that apply. it is the remains of an organism still found alive today. it is the remains of an organism that was alive for only a short time. it is the remains of an organism that is found in abundance nearby. it is the only fossil for this type of organism that has ever been found. it is the remains of an organism that lived in a narrow geographic area.