Which of the following can be used by scientists to date the sediment layer they are found in? select all that apply.

radioactive isotopes
fossils
tree rings
animal growth rings
mineral elements

need answers asap

3. in the fruit fly, recessive mutation brown, b, causes brown color of the eye and absence of red pigment. recessive mutation p of another independent gene causes purple color of the eye and absence of brown pigment. the cross of a brown-eyed female and purple-eyed male produced wild type eyes. what will be the colors and their ratio in f2?