which are accurate statements about dark matter? select the two correct answers
a. scientists thoroughly understand what dark matter is and what it does
b. new data could cause scientists to change their hypotheses about dark matter
c. scientists have hypotheses about dark matter but need more data to test their ideas
d. scientists are not convinced that dark matter exists
b. new data could cause scientists to change their hypotheses about dark matter
c. scientists have hypotheses about dark matter but need more data to test their ideas