After performing an investigation, a scientist produced results that did not support the hypothesis. Another scientist does the same experiment and her results do support the hypothesis. What should the scientists' next steps be to make sure any claim made regarding these investigations is valid?

the darker peppered moth species were favored due to the fact that the industrial revolution had made all the nearby trees a darker color instead of white.

the unequal cytoplasmic division that  results  in  one egg  and three polar bodies ensures that a fertilized  egg has  ample nutrients  forits journey  to  the uterus.

a symbiotic relationship with the mitochondria