An individual has parents who are both carriers of the recessive allele that causes cystic fibrosis. neither parent is affected by the disease. what is the chance that their offspring will have the disease? a. 0% b. 25% c. 50% d. 100%

When new rock is added to an oceanic ridge, the magnetized strips on either side of the ridge are evidence of sea-floor spreading. this is because the rocks on the two sides of the ridge o are equal in width and in polarity are polar opposites oare magnetized vary in width but are equal in polarity