All arteries carry oxygen-rich blood, whereas veins carry oxygen-poor blood. all arteries carry oxygen-rich blood, whereas veins carry oxygen-poor blood. a. true b. false

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.