Which characteristic do scientists first consider when classifying cells aseither eukaryotic or prokaryotic? o a a membrane-bound nucleus, which is exclusive to eukaryotic cellso b. a membrane-bound nucleus, which is exclusive to prokaryotic cellso c. chloroplasts, which are exclusive to eukaryotic cellso d. chloroplasts, which are exclusive to prokaryotic cells

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.