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%

the chance is 25% because the grandparents both have it

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs

its temperature is increasing. this causes molecular vibrations to increase.