Why are antibodies from White Blood Cells so important when getting a blood transfusion?

Why might surface mining be less risky for miners than underground mining? a. surface miners can become trapped in a collapsed mine. b. surface miners work in dusty, enclosed areas. c. surface miners work aboveground. d. surface miners use elevators to enter mines.

What came first egg or chicken? and is tomato a vegetable or a fruit?

What must be true for natural selection to heppen