Why is a person with type o blood called a universal donor?

What does the sociological imagination refer to?

How to fix water drainage problems in yard

Andra has a family history of osteoporosis. her doctor advises her to eat foods rich in calcium. which foods should she add to her diet? a. fruits, especially grapes and berries b. unsaturated fats like olive and soybean oil c. beet greens, broccoli, and cheese