Protein molecules called cytochromes are oart of the electron transport chain. they are nearly identical in every known aerobic organism. how do these molecules shoe the unity of life on earth?

Select all the correct answers. for a claim about the natural world to be considered scientific, what attributes must it have? a). it must be open to modification if new evidence doesn't completely support it. b). it must be based on scientific observations that can be repeated in a controlled setting. c). it must be applicable to future events and occurrences. d). it must be consistent with only a small portion of relevant observations or data.