Which of the following effects in Congo has been caused by the increasing value of coltan? violence over control of coltan resources
violence over control of diamond resources
demand for electronics
increased tension between the Hutu and the Tutsi

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.