Which type of anemia is caused by a vitamin b12 deficiency attributable to congenital or acquired deficiency of intrinsic factor (if)? folate-deficiency anemia iron-deficiency anemia pernicious anemia sickle cell anemia?

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