Final answer:
Megaloblastic anemia is the type of anemia characterized by large, immature red blood cells and caused by deficiencies of folate and vitamin B12. It involves a deficiency of these essential nutrients, which can result from a diet lacking in meat or sufficient vegetables.
Step-by-step explanation:
The type of anemia characterized by large, immature red blood cells and caused by deficiencies of folate and vitamin B12 is known as megaloblastic anemia. Megaloblastic anemia involves a deficiency of vitamin B12 and/or folate, and often involves diets deficient in these essential nutrients. Lack of meat or a viable alternate source, and overcooking or eating insufficient amounts of vegetables may lead to a lack of folate.